For me, the KVK is ...

... a very great working aid

... indispensable when searching for foreign digital copies and cataloging old holdings.

... an irreplaceable database for worldwide literature research

... for me, the KVK was a change in the world of work, a gamechanger in research. Today it is an integral part of my work and the tool of choice when I teach research skills to students.

... a wonderful help in my work as a librarian. I am grateful every day that you have developed and maintain it.

... a great help

... a help in cataloging media

... an extremely important working tool! Thank you!!!

... the perfect overview

... one of the best international catalogs.

... daily bread and great miracle machine, because I can consult so many catalogs in one go. A big thank you!!!

... almost irrelevant in my daily work.

... a real benefit for my title research!

... ... an indispensable, even blessed contact point, without which one would no longer want to imagine scientific research.

... indispensable.

... an invaluable source for literature research and cataloging.

.... as an antiquarian bookseller, an incredibly useful source of information for the bibliographic cataloging of my books.

... a central working tool that has accompanied me faithfully and reliably every day for many years and that I would not want to do without in the future. Thank you and please keep it up!

... an indispensable work tool as a librarian. During my [Hochschulveranstaltung/im Labor:] lab(oratory) (course) / within the Uni: practical course, I learned to work intensively with the Karlsruhe Virtual Catalogue website and still use it regularly today to find records from my own or other libraries that serve as a guide for cataloging. Thank you very much for having this great tool - and congratulations on your anniversary!

... perhaps the most important library internet tool.

... an important search portal for books, research reports, dissertations, doctoral theses and much more, simple and clearly structured. I linked the KVK to my first intranet page in Mozilla in 1996, which also started at that time. I still find many sources for our scientists here -- an important building block for our research. Keep up the good work.

...irreplaceable for my work in the library.

... the most uncomplicated title research tool!

I wouldn't want to do without the KVK!

... an important tool

... a great tool for finding out how often a publication is available or referenced in Germany. For us as a specialist library, it's a good way of showing that our holdings can't simply be replaced or disposed of.

... a standard tool for researching supra-regional availability.

... an indispensable research tool

... a great treasure and indispensable in daily work!

The KVK provides the answer to the question of whether a particular work exists.

... the linchpin of my literature research.

... invaluable for my research as a librarian, as I consider the title records (especially in K10plus) to be very good and like to use them as a guide

... one of the greatest librarian tools.

... an indispensable working and reference tool for working in a small special library

... an important aid for everyday library work.

like the cherry on the Black Forest cake.

... indispensable!

... indispensable. It makes our work much easier. Without the KVK we would be lost.

... a good source of data that supports me in my day-to-day work of cataloging and cataloging collections.

... a gateway to the German library world and welcome support in my day-to-day work.

... a helpful tool for cataloging to see how titles have been recorded in other networks.

... a very important work tool that shortens and simplifies many work steps.

... an indispensable tool for my subject librarian work.

... makes my work incredibly easier!

... a fortunate coincidence, as there is no national network.

An ideal tool for researching already digitized media

... the best research tool for national and international searches.

... *the* central tool for bibliographic searches - congratulations on your 30th anniversary and thank you for your great work!

... the place where I get an overview of international research on a topic

... a super practical and clear tool for researching in other union catalogs.

...... is the best solution so far in the absence of a national library platform.

... the multitool for interlibrary loans.

... an important research tool for the holdings in other libraries

a necessary work tool

An indispensable tool when your own library catalog is no longer helpful.

... a constant companion - from first semester students to subject librarians

... my number 1 research tool when I can't find a title in K10plus or the title listing is a mystery.

One for all / the quick overview of library holdings (especially for Germany)

Also suitable for looking up classifications ;-)

... an indispensable tool for researching analog and digital publications across all borders.

... an important tool when it comes to research requests from users and I want to research beyond the network or internationally.

... a national and international inventory overview and therefore my first port of call when I want to search beyond my own library. THANK YOU KIT for the initiative! My No. 1 for 30 years.

The KVK has become indispensable in my daily library work, especially in the reference and interlibrary loan areas.

Every time the KVK is presented, it is a source of amazement and a real wow experience for the students at the vocational school.

...a little dusty, but always reliable and efficient.

... indispensable in my work!

... an indispensable tool for my daily research as an editor. Congratulations on your anniversary and thank you for having the KVK!

... the only replacement so far for a missing union catalog in the German library system and access to the holdings of libraries worldwide. Indispensable.

... the research tool to see where a work is available.

... a daily companion.

An indispensable research tool! Thank you very much

... an indispensable tool for interlibrary loans. Germany, Austria, Switzerland at a glance and also indispensable for international interlibrary loans.

... an indispensable tool since 1999, the year I joined the library profession. The KVK is an integral part of my daily work and I appreciate the quality, the ease of use and the fact that I can use it free of charge. Many thanks to the developers and the team that keep the KVK running (and financed ;-). P.S. I still remember that I felt very daring when I used the KVK in my bibliography and interlibrary loan lessons during my training as a graduate bibliographer, even though it was not yet officially allowed to be cited as a source :-).

... simply incredible. It was and is groundbreaking, I've been using it ever since it came out.

... a helpful tool that shows me a lot of information with one search.

... has been a good working tool for years - especially when it comes to international offers.
The search for copies has (generally) become more difficult, as many library networks now also offer digital copies, even if the books are really only available 2-3 times throughout Germany. This makes it a little more difficult to compile an overview of the real printed items, especially for old prints.
But the KVK is still indispensable... -it even rhymes. Happy birthday and here's to another 30 years - I hope retirement or the retirement home is not yet in sight (from the point of view of the donors...)

... an indispensable tool in view of the continuing lack of national research opportunities in Germany.

... an outstanding example of the fact that important infrastructure in the German library system is often based on the initiative of individual institutions.

... indispensable

... an indispensable supra-regional research tool.

... one of the most important bibliographical reference works, without it I would have considerable and in many cases probably unsolvable difficulties when researching international literature in particular

...an indispensable research tool. Keep up the good work!

... an indispensable work tool.

... still the non plus ultra of a library catalog.

Was already a standard tool in my browser bookmarks in the first Netscape Navigator (back then in the HBI ;-) ).

... as a librarian an indispensable tool in my daily work

... an indispensable information resource, especially for rare and foreign-language titles.

... still the quickest and most convenient way to find out where and in what form a particular title is available and how it has been cataloged. Also very helpful to get an initial overview of (complicated) MTMs.

... a unique tool for quickly obtaining information on holdings nationwide and beyond.

... simplifying

... a great research tool!

... a step towards a world catalog.

... a reliable basis for researching existing catalog records.

... a very important research tool. Indispensable for cataloging as well as for interlibrary loan!

... an indispensable tool for ordering and cataloging books

... the perfect tool for finding media that are not available in the network or country.

Indispensable!

...the beginning of my professional training, still a great search engine and one of the most important library reference tools.

... a tool for my work as a librarian.

... during my time in the information and interlibrary loan department, the KVK was the indispensable research tool I used every day!

... a helpful tool to support me in my own work in the library. Something I like to recommend for literature searches because it is so comprehensive. And also always something to show how libraries are interconnected.

I've been using KVK for about 20 years, both for my original research and for my hobby research. In the first case I look for the latest publications, in the second case mainly for older ones. I also refer to KVK.

... is a great help. It is well structured, but the search for many hits is a bit cumbersome. Especially if you are looking for older editions. But otherwise great.

... an indispensable research tool, a constant in my professional life - we have almost the same anniversary, the KVK started a year before me :)

Keep going, you are an enrichment!

...... irreplaceable in the context of sound scientific work!

... THE best library work tool. No research is possible without it. Even today. It saves me every day and I am very grateful that it exists.

Congratulations and thank you very much!

... the best replacement for a German union catalog like other countries have had for a long time.

... indispensable! Because books are indispensable, both privately and professionally, and KVK knows them all ;)

... indispensable for my scientific research. I like the search options, the filter options, the very broad international search. Since I am a musicologist specializing in Bach research and am very dependent on researching early prints, the facets of the search are important for my work.
Thank you very much for your work at the KVK!
As I manage an online database myself (and set it up 25 years ago): www.bach-digital.de I know that encouragement sometimes does you good.
Kind regards from the Bach Archive Leipzig

... indispensable for gaining an overview of the diversity of the German catalog.

... the most important meta search engine for books in libraries, for book trade portals and for searching for digital media.

..., one of the best research tools for my work :), please keep it up

...: Reliable source of information; fast search; usually with absolutely precise results; an inexhaustible source of information and links :)

...the search engine for the international literary overview

I'm an Italian librarian and KVK is a great resource when I'm looking for a difficult-to-find book for my customers

... very very helpful, please continue, thank you very much!

... indispensable for my daily work.

... an indispensable tool for searching library collections from the DACH region and worldwide.

... a great research tool that I use almost several times a day. I work in formal cataloging in an academic library and used the KVK extensively over 20 years ago during my studies. Thank you for your great work and I wish you all the best for the coming decades!!!

... an important tool in my daily work.

... a tried and tested search engine for many years to find national and international literature...

... a great institution for searching and finding literature.

... an essential search for bibliographic data

... a super helpful tool in the department that I wouldn't want to do without!

...a super search engine

...often a lifesaver when I have searched in vain for a title.

... the only way to get a good overview of the holdings, especially (but not only) in German libraries.

... a great search tool. I compile the university bibliography of the Freie Universität Berlin (approx. 6000 publications per year) with often very cryptic and/or incomplete references. Without the KVK I would often be at a loss. I love it (always have!) :)
I was only angry once when I read on your site on April 1st that the KVK was being discontinued. I almost had a heart attack ;)
Happy Birthday, old house KVK !!!

... an indispensable tool since my studies.

An indispensable work tool, despite all its shortcomings and limitations.

...very important

...the most important institution for researching digitized specialist literature, so congratulations on your 30th birthday!

... an indispensable research tool, especially in library catalogs worldwide (because I have the union catalogs in our online interlibrary loan) and in the book trade/antiquarian book market. It's a great search engine for bibliographic data and for owning libraries.

... indispensable!

Through its data, KVK enables me to participate in many centuries of human activity.

... VERY IMPORTANT

... indispensable. I am researching children's and youth literature between 1933 and 1945. Some works are almost impossible to find, and the KVK has often provided important information.

... THE pivotal tool in many situations.

... essential, as it brings all information together.

... one of the most important research tools, invaluable.

... next to Zack! one of the two well-known meta catalogs and the one that is always being developed further.

... an indispensable working tool.

... THE catalog of German-language specialist libraries!

... a reliable, serious, scientific and (democratically) accessible knowledge base for everyone.

... an important tool!

We couldn't work without the KVK, please give it another 30 years!

... an important research tool, which I am also happy to recommend to our users.

... not as good as the Worldcat

... as a journalist (freelance, in Germany for F.A.Z.) very, very helpful.

The most important metacatalog and an indispensable working tool.

Thank you for the KVK :-)

... immature.

... a fine thing

... THE main tool in my library work. I can't imagine anything better!

... a central research tool that I can't do without.

... a very good working tool.

... ideal for finding out the availability of literature quickly and reliably, both nationally and internationally

... the central reference tool for making decisions about what to sort out.

... the best reference tool for searching all national and international holdings for a particular title at a glance.

... an indispensable aid when searching for individual titles, cataloging and thematic research.

What a relief in my daily work! I wouldn't want to be without it...

... a very useful research tool

an indispensable, irreplaceable aid for researching secondary literature.

... a comprehensive and important reference tool.

... a long-standing, reliable partner without whom I would very often be at a loss in interlibrary loan.

... a helpful and above all reliable tool that I use regularly in my everyday work. I wouldn't want to have to do without it.

... a great aid in everyday library life.

... an important tool for finding rare works quickly and easily, especially digital copies worldwide.

... indispensable.

... indispensable. - And all my students get the information: Look in the KVK!

...a wonderful research tool that I wouldn't want to do without

...irreplaceable :-)

...... an excellent source of bibliographic information that helps us a lot in our cataloging work. Thank you very much for your work!

... an indispensable tool for my work.

...an instrument for making acquisition and disposal decisions. Which other libraries still have a title? Is it important that my library (also) has it, or is the supply sufficient?

... the best way to search for literature titles.

...an indispensable tool that would have to be invented quickly if it didn't already exist!

It has been an important tool for me for about 29 years and has become even more important and valuable over the years, especially with the additions and improvements to the individual union catalogs (here for my purposes mainly K10lus, VD16 and VD17). I always refer students to the KVK.

... a wonderful tool for comparing catalogs from different libraries. This saves a lot of time during research.

... the clavis publica principalis bibliothecarum et scientiarum

... an indispensable part of my daily work!

... an indispensable tool for getting a quick and uncomplicated overview of the literature available in various institutions. It enables us to help users quickly with inquiries to our library.

... a very important research tool.

... an indispensable gateway to worldwide literature research and an impressive example of how digital networking makes knowledge accessible without borders.

... a really great tool! Helped me wonderfully with my Master of Arts thesis many years ago and continues to do so in my professional life!

... despite the changes in media usage and technical development, it is an outdated but much-loved metasearch engine that I still like to use.

... a wonderfully helpful work and research tool.

... a cross-network catalog.

A help for studying.

... an important information tool that I use every day as a librarian.

... an important tool for my work in the library.

... an almost everyday and indispensable tool in the acquisition work for the collection of German prints

... still an indispensable platform for daily work.

... a very important research tool - especially in my work as an acquirer at a university library. The KVK helps me to find and compare antiquarian offers quickly and easily and, if I am unable to obtain the title from an antiquarian bookseller, to find out directly whether the title is available through interlibrary loan or online. At this point: a big thank you to the KVK team!

... a great, clear and absolutely indispensable tool.

... sometimes a real lifesaver.

a great research aid. Thank you!!!

... a very helpful tool for daily work. Thanks for that!

... a very important search engine that supports me in my work in a library.

The KVK catalog is indispensable for me. I am a librarian and responsible for interlibrary loan at the University of Salamanca (Spain). For us, the KVK catalog is an indispensable tool in our daily work to find books all over Europe. It saves us a lot of time and enables us to forward requests to the right libraries with absolute certainty. We congratulate the KVK team on this invaluable tool for library services across Europe.

... helpful.

... an important tool for making acquisition decisions for special needs.

... indispensable

a great overview

..., ..., ...!!!

... a companion since my studies. You know him and you can rely on him.

... a universal overview

... a constant in change, a treasure trove and sometimes a lifeline.

Thank you and congratulations!

... the hammer (if you have to hammer in nails every day).

... good

I can no longer imagine the library system as it is today without the KVK. Many thanks for this wonderful research tool!

... a very helpful tool for subject reference work.

... a powerful bibliographic reference tool for which I know of no substitute.

... an important research instrument

... THE search tool for efficiently researching interlibrary loan holdings throughout Germany and Europe!

... a central source for literature research. Keep up the good work!

A totally important tool. It's impossible to imagine everyday library life without it.

... the bedrock of all catalogs.

... an indispensable working tool, for many, many years - almost since the beginning! I work in the library sector and it is impossible to imagine my everyday life without the KVK.

A wonderful catalog for literature research.

... a working tool

The KVK is very useful for my work as a librarian

... an indispensable source of information on rare and valuable editions from the 15th to 19th centuries as well as bibliographic data needed to identify editions.

... reliability, sometimes more than Google, excellent in old holdings, interesting TA versions, for me the impression of a 'silent, reliable, unique service provider' is evident

Extraordinary help for research, bravo!

... an indispensable tool which, with its ability to search libraries and online portals worldwide, makes my search for books much easier and shows me exactly where I can find them.

... as an antiquarian bookseller, it is an indispensable tool for finding titles. The stored bibliographic information helps me to check books for completeness and thus ensure that my customers are always satisfied.

... a great example of librarian hands-on mentality: Even after 10 years in librarianship, I find it hard to explain that there is no official Germany-wide catalog. The KVK closes this glaring gap.

... an absolute relief when searching for and verifying literature

quick worldwide overview in german language

A huge relief for my everyday work!

... a super important tool for the daily search for specific titles, the verification of bibliographic data and availability in libraries. It is very helpful that numerous international libraries are included, unfortunately not (any more) the Library of Congress, which is probably due to the LoC :-).

... a very useful research tool, with a focus on digital media.

... indispensable for interlibrary loan and especially international interlibrary loan.

... a large data pool that can and could help in many cases and questions about book data.

... ...

... an important part of my professional life!

... a helpful tool that makes my work easier on many days.

a one-stop-shop reference tool

... an indispensable research tool since my studies. Thank you!

... a wonderful tool!

... one of the few search tools that doesn't have some damn AI interfering and thinking it has to be smarter than you when searching ... ;o)

... (almost) always the first search entry.

... now really indispensable.

My thanks to all those who have made this platform possible and who maintain it.

... irreplaceable in my everyday work

... still an important search tool for supra-regional literature research and procurement.

... indispensable as a cataloging person as a work support and to save time.

... the ideal overview tool when I get stuck with interlibrary loans in our union catalog

... an indispensable information tool that still helps me in many situations in a simple and uncomplicated way.

Often the first port of call - whether checking literature sources for availability in library collections, second-hand bookshops or...

... Very helpful

... a huge relief, easy to use and indispensable.

... the best catalog available online and an indispensable resource for me!

...totally helpful to get a comprehensive overview of the library holdings - especially historical holdings and rare titles are easy to find via the KVK.

... impossible to imagine life without it!

Many thanks to the initiators and creators of the KVK and Happy Birthday!

A librarian who learned to use a card catalog.

... important - important - important! I've been using it for 28 years. Not important but funny were the April Fool's jokes that took place several years ago.

... an important tool in everyday library work.

... an indispensable work and research tool for many years.

... research tool for catalog records.

An indispensable and great tool for distributed literature research

... an indispensable research tool

...as old as my professional career :)

...the best union catalog that Germany has to offer.

... the fastest way to find a medium in the whole of Germany.

...a basic working tool that I wouldn't want to do without!

an indispensanble tool

... the research tool that I use to find credentials for titles, especially international titles, that are not listed in any of the German library catalogs.

... indispensable

... essential for my research

... indispensable. Whether credentials searches, correct bibliographic data or thematic literature searches (if indicated by the genre I am looking for), I can rely on the KVK search to help me.

... young at heart, always evolving and a really good friend.

...one of the best solutions despite US technology and self-determined detour and sponsor-free!

... the best research tool for digitized old prints. <3

... as a librarian ... completely indispensable!!!

... essential

... a very important working tool, starting point for international research.

A phenomenal tool for serious literature research - even in the 20th century.

I first heard about it in the mid-90s and was immediately impressed.

... an important research tool - first at university and now at work.

... an important work tool for 30 years

... the easiest way to query various book trade directories at once.

... a practical and reliable working tool.

... indispensable. An important research tool.

... the mother of all book engines ...

... irreplaceable - if it didn't exist, it would have to be invented.

... a very good research tool.

... a reference work, a great metacatalog, but also a bibliographic database, search tool for libraries worldwide, bookshops, antiquarian bookshops, etc. I use the KVK almost every day and am very happy to have so much information bundled together and from one source.

... a veteran

... indispensable for 30 years, a lot of work because some catalog is always broken ;-)

... an absolutely indispensable, very well-functioning and extremely helpful research tool for many years. Many thanks for that!

... simply irreplaceable. Without the KVK, scientific work would not be possible for me.

... an indispensable research tool

... the most important tool for online bibliography.

...the most uncomplicated overview you can get of the stock of books worldwide. This makes it easier to catalog books from different countries, for example. Especially since the worldcat has been included!

... as important as a fishing rod for an angler.

... makes work much easier

... an optimally functioning search engine :-)

... an absolutely important tool!

... essential for my work as a scientist!

... an ingenious research tool that I love to demonstrate in training courses.

... a door to the world.

Indispensable for my work in an academic library. The KVK is one of the best research tools for books and digital copies. I really enjoy using it and recommend it to all types of users for their research.

... a very important tool in my work as a librarian.

... indispensable in my work as a librarian / subject librarian. Since day 1.

... a wonderful, reliable metacatalog and an important tool for everyday work in academic libraries.

... irreplaceable.

... important. Supplement to Stabikat and WorldCat. Irreplaceable.

...For a book collector, KVK is the beacon in the desert, and crooked metaphors don't change that.

...very helpful and useful

... an indispensable tool for literature research.

... a great and important instrument!

Keep up the good work and a big thank you to those responsible!

... the gateway to research, simply indispensable.

I have been working with it for 30 years. ... a source of scientific life, available 24/7, a research medium that very rarely leaves questions unanswered. I can quickly jump back and forth between the libraries that are relevant to me and compare them.

It's unbelievable how quickly the title details on the hundreds of thousands/millions? of index cards in the libraries have been digitized. I can only think back to the tedious hours of leafing through the index cards on site.

... great.

... an indispensable working tool of the highest reliability. I thank its 'makers' for 30 years of bibliographic revelations.

... indispensable in my bibliographical research, my unique and competent interlocutor. Thank you!

...for a good 20 years a very good aid for my work as a historian and archivist, which has often helped me very well. ... indispensable. I still fondly remember how one of my colleagues once gave me the hint rather en passant.

... an indispensable research tool! If it didn't exist, it would have to be invented.

Nevertheless, I would like to see it become even more international for the anniversary.

It would be nice if the KVK were to include even more non-Western catalogs and enable searches in even more diverse languages and scripts, both the KVK itself and the integrated databases. UTF-8 should be standard for all databases and interfaces.

... indispensable. My work would hardly be possible without it.

... the reliable and comprehensive source for citations - thank you for having it!

... an essential bibliographic research medium. Unfortunately, it is sometimes not possible to call up a title because the library in question has a system error.

... the most important research tool, and has been since its beginnings! An indispensable aid for all scientific research, which I recommend again and again.

... an indispensable research aid in the subscription department of specialist retailers.

... an indispensable aid.

... an invaluable resource for the international library community. I am an interlibrary loan librarian at a university library in the United States and frequently need to request materials from European libraries. The KVK makes searching dozens of library collections so quick and easy. Thank you so much! Cheers and all the best for the next 30 years!

above all a research tool that was impressively introduced to me in my student days.

...one of the most useful online tools there is. Functional, fast and efficient!

Many thanks to the operators!

... an outstanding, extraordinary, wonderful, great, terrific - I'm gradually running out of positive adjectives - literature service that can't be replaced by anything else. A must for all those who write about industrial culture and the history of science and technology!

... a valuable addition for research.

... a companion since I started my career in 1996/97. Before that, when I was studying librarianship and during the practical sections, I had to laboriously search the various union catalogs one after the other when signing the pink interlibrary loan forms - the KVK as a meta-catalog was a real innovation. I still feel that way. Other developments at that time have not survived (Metager), Google only came along in 1998.

...an absolutely indispensable aid for various literature questions

literature questions regarding domestic and foreign titles, for which my special thanks and

a great appreciation!

I really appreciate the cross-network search, but also the possibility of searching in several bookshops at the same time. This helps me to close gaps in the antiquarian market cost-effectively.

... an indispensable research tool. As a translator, I often search for German translations of international titles.

... an indispensable tool.

... the greatest research tool for my work, without it everything would be a lot more tedious, I can get a lot of information quickly at a glance! You made my day!

the best literature search program in Europe

... the most important database!

... an important tool for obtaining information.

the absolutely most reliable instrument for literature searches

... vital for authors, literary scholars and editors

... the final port of call when nothing can be found locally or in a network.

... an important working tool that I would not want to do without! Happy birthday, dear KVK! :)

... an important tool for interlibrary loan work.

... the epitome of bibliographic networking (national and international) and has been an integral part of my everyday library work for years. It also offers low-threshold access options for everyone and is a systematic and reliable tool even in times of AI.

... the lifeline when I can't find media via the K10plus.

Dear colleagues,

Apologies for writing in English. Unfortunately, I don't know the German language, but I am a really grateful user of the KVK, and I want to thank you All for your incredible help.

The KVK is a wonderful and essential resource for my daily work as a Language cataloger at the British Library, UK, (and previously at the Ca' Foscari University Library, Italy). I know that I can always rely on the careful cataloguing job of first-class colleagues all over Europe, in particular the German colleagues (a special thank to Munich Library for being so quick in sharing the first record accessible in KVK, or records quite difficult to find elsewhere!) Your collaborative attitude is an asset!!!

Thank you All, and many congratulations on this 30 year Anniversary, and on more anniversaries to come!

...Important, as I need it for my daily work in the library

... a great thing

... one of the most valuable resources in everyday library life.

... an incessant and extremely valuable work tool that I wouldn't want to do without.

... the one and ONLY thing. No master's thesis, no dissertation, none of it would have been possible without KVK. Brilliant! Congratulations from Switzerland .

... an indispensable! research tool.

... very helpful.

An indispensable tool in my work as a librarian

an important tool for cataloging.

... indispensable as a cataloger of old collections for worldwide research, especially the search function for digital copies is very helpful.

Thank you for the offer and please keep it up :)

an institution worth preserving, which emerged from an idea that was as simple as it was effective. Back then the KVK was ahead of its time, today it can rightly be described as having aged well. Here's to the next 30 years ;-)

A treasure trove - international and versatile

... an indispensable source of information that supports my work every day.

An indispensable tool for my work as a librarian.

... by far the most important entry point into the book search

... an important catalog in my daily work.

Very important research tool for cataloging, especially through the international library catalogs

... indispensable in everyday work at the reference desk!

... an important research tool, even if the need is not great. I work in an institute OPL in the natural sciences Division, where 90% of literature requests concern current journal articles.

... a valuable tool that I also recommend to my students.

... an essential research tool.

The KVK is my favorite and most reliable working tool of the last 15 years. Many thanks for the stability and continuity of the service.

... one of the best inventions of the last 30 years, a constant companion in my everyday working life and more reliable than the Swiss Federal Railways :-)

... a good tool for finding titles that are not available in the German-language union catalogs.

... still the tool for researching library collections worldwide, but also in the book trade. Thank you for that!

... an indispensable tool for my scientific work.

... very valuable help

... an indispensable working tool.

... a valuable and indispensable daily aid when working in an antiquarian bookshop. Thank you very much for providing and maintaining the data and congratulations on your anniversary.

The KVK was an important tool for me when purchasing sheet music and books for the music library and is a necessary source for me privately.

...indispensable.

Unimaginable if it didn't exist!

... particularly important.

...an indispensable tool

...the best catalog for finding rare literature

An important tool for interlibrary loan.

... a very useful tool, albeit with pitfalls: For example, some catalogs often report back that they are blocked. It is astonishing that the basic need for a worldwide federated search has remained. The WorldCat promises more in terms of name, but the KVK has by far the greater practical benefit for finding holdings records. It is gratifying that it exists, and if it didn't, it would have to be invented. The proud age of 30 years is reason enough for a hearty birthday wish and congratulations to the KIT Library as inventor, developer and operator.

... an indispensable tool for identifying and providing early modern literature

... a very valuable tool.

... indispensable ! It has helped me (book collector) countless times since the beginning and brought me the joy of discovery. The concentration of so many sources of information on one page is so helpful, so time-saving - indescribable! How good that it exists.

... hardly or not at all dispensable when searching for old Hölderlin prints (in almanacs, anthologies etc) - THANK YOU!!!

...an important tool

... an important working tool

... a direction to which I am very grateful for their work

... an impeccable research tool for finding antiquarian books and their sellers!

I deal professionally with German-language books in all subject areas. KIT has been providing me with valuable information on almost all my questions for years. I would not want to be without this database

... an indispensable tool for my research.

...... ... the way to hundreds of libraries and databases from the comfort of my desk.

... one of the most important and useful tools for research

...an indispensable research aid

...one of the most important literature research media. Throughout my studies, a constant point of contact when it comes to literature searches!

... a central working tool

...an important bibliography tool.

The meta-database par excellence!

... an irreplaceable tool for your work

... a reliable overview of the dissemination of literature and an indispensable research tool

... blocked because of the survey

... an indispensable tool when I, as a Wikipedia author, verify references or add to bibliographies.

A much-loved help

... a very important tool for the cataloger's work. Thank you.

... indispensable. I always search in my home library first and if I can't find anything there, I go to the KVk.

An important research network.

... a treasure and a time saver

... makes my work easier

... indispensable. I always search in my home office first and if I can't find anything there, I go to the KVk.

... indispensable

... indispensable

an irreplaceable daily research tool

... often helpful

...very good

...a rich treasure trove.

the largest conceivable treasure trove

KVK is for me ...a good source

... an indispensable aid.

... a very useful tool.

... an extremely useful aid for literature research.

The KVK was an indispensable aid for me (during my active time) when researching for the

signing service. I like to remember how quickly Mr. Dierolf repaired things when a library was not accessible because links or the whole system had changed.

Now I only use the KVK privately, but sometimes quite intensively.

... an indispensable tool for literature research because it provides more complete search results, more carefully curated metadata and more comprehensive information (such as paginated tables of contents) than any other discipline-independent information service provider I know of.

... an indispensable working tool since its very first days. For my own questions, but also for advising library users. I can still remember the incredulous amazement of our users that something so useful should really exist ...

... an indispensable point of contact when searching for literature and a reliable source of information

... was/is an indispensable tool for literature research for me as a former librarian.

... one of the world's best achievements within the Internet. It has never let me down since its introduction and shows time and again how incredibly helpful the intelligent, reliable network of library catalogs is. A big thank you to the initiator and the entire team behind it!

... indispensable

... enrichment

... a fabulous research tool. As a music historian and former librarian, I am sometimes asked to write essays or texts for program booklets - the KVK is a great source for finding one or two titles and then ordering them from the LVK.

The KVK is my search and link list to all the important library catalogs in the world.

Very helpful and should be much better known

... a perfect source of information

... an important tool in daily library work

... indispensable!

...indispensable!

...indispensable for my academic work

... ... the central point of contact when I want to find out in which library a particular book is available.

the best way to research titles. The national library database SLSP in Switzerland is an imposition as far as the user interface and search options are concerned. I can also find the titles listed there in kvk - only much more clearly. Please continue for at least another 30 years.

... an indispensable scientific tool for my field of work (economic and social history)

...an indispensable aid

...an indispensable aid

... an important working tool

... a reliable and indispensable instrument for thirty years.

... a valuable companion for many years. In the beginning it was groundbreaking, so much information on one interface. I now use the KVK less often, only for specific questions, but I wouldn't want to do without it.

...a reliable tool for daily literature research for 25 years now! Happy birthday KVK!

... a great help in my work as a librarian

... searching library catalogs worldwide

... I am a cataloguer in Italy and KVK is an essential resource for clarifying the most difficult titles and their large-scale configuration: it is a fundamental help with the reconstruction of complex editorial contexts, unclear titles and bibliographic resources whose nature is not fully understood.

... the most reliable literature search portal.

... a frequently used research tool.

... a working tool

... an indispensable aid for literature research

... indispensable - I am an interlibrary loan librarian ....

A small request for international research: WorldCat and the British Library regularly block requests - perhaps an extra note would be useful here.

... a working tool in my daily work as a librarian to check the holdings of my own library across the board in networks and thus to do preparatory work for our subject librarians.

... a compass in the knowledge landscape.

... new

The gateway to the library world ... and sometimes the last resort :-)

... a valuable reference tool.

... an important research tool

... the central platform for searching for books by topic.

... a good thing

... an immeasurable help in everyday professional and academic life.

...indispensable.

...indispensable.

... a companion and help in everyday working life since my studies at the end of the 90s.

... a helpful research tool

... always the last hope when I can't find a title in other catalogs.

... a lifesaver when cataloging and comparing the holdings of international journal titles missing in the journal database (ZDB).

The KVK catalog is a very useful tool for me in my daily work as a librarian. I find it extremely practical to be able to search several catalogs at the same time and to check catalog information and the availability of works with just one search.

... a great help

... as a student assistant who has to make an incomplete bibliography ready for publication, it makes my work much easier.

... the most important source of bibliographic information and book availability. Absolutely indispensable since its creation. (And many thanks that the KVK has not ended up in the big project graveyard like many other undertakings!)

... the fastest and most comprehensive search engine for literature that I have been using for almost 20 years

... indispensable for bibliographic research worldwide.

... an indispensable finding aid

... sometimes too complicated to use, but basically helpful.

... indispensable for literature research, especially when searching for the availability of individual titles and their year of issue.

... a wonderful institution that saves a lot of time for time-consuming research.

... a practical tool for searching for bibliographic information

The KVK is indispensable for my work

... the first port of call for bibliographic searches for twenty years

... important because it shows me whether books cited in student papers actually exist (AI hallucinations).

... an almost daily companion.

... indispensable in my daily work!

... an important resource that is underestimated by users.

... cohesion of knowledge transfer

... an essential tool without which my work would be SIGNIFICANTLY more cumbersome.

... invaluable! Especially in the area of old holdings for determining authors or years of publication. The digital copies are also just great to see whether it's the same or a different copy. And that worldwide!

A kingdom for the KVK!

...you can rely on me to do good research ...

A sign of successful international cooperation!

... a lifesaver

good scientific research

... very useful because you can search many libraries with a single search. I don't use the international search very often. But I think it's very good that it's included. The design is simple and functional and saves resources in its simplicity. That's a good thing and should remain so, especially in view of the sharp rise in energy consumption by digital applications.

The KVK is one of my most important work tools! As an employee of a specialist library, it is indispensable for me. I am very grateful for the opportunities it offers me and for how reliable it is. Whether national or international, cataloging or interlibrary loan - my first port of call for books is always the KVK. I couldn't imagine my day-to-day work without the KVK. A big thank you for the great work that has been and is being done here. :)

... an important work tool - serious, reliable and familiar.

... the all-rounder for research and indispensable! Anyone who has searched with printed bibliographies or microfiche knows why.

... an excellent research platform - everything at a click!

The most important search engine for schol. Books and journals in Germany.

Long since an indispensable tool.

... a wonderfully reliable source for daily work!

... a very helpful support. Whether cataloging old or new holdings, retrieving title records in other libraries provides an important basis and gives security in formal and subject indexing

...very important

... a great world of books! Many thanks for your work! Every time I think about your staff who have done so much good work for me. KVK especially helps me to find and identify rare editions. A librarian.

... ... was the most important and most reliable database for scientific research during my studies and I hope that it will always be maintained, even if I need it less often today for professional reasons.

... an important bibliographic source.

... an additional research tool. I often find titles in it that the VD16 or VD17 do not have or that are hidden by complicated spellings (e.g. VV instead of W, n with tilde, etc.). If the VD16 or VD17 numbers were also given in all entries in the KVK, it would be ideal.

... a very useful platform that gives me the best overview of the availability of a book in German libraries and online bookshops!

... the basis for lectures and exhibitions

... the best digital research tool for specialist literature that I have ever come across.

... a radar.

... extremely important!

A great tool for comparing different title records from the individual associations.

... an indispensable directory for my daily work.

I wouldn't want to be without it.

... congrats

The KVK is an indispensable tool in library reference and interlibrary loan work

source of information

... irreplaceable, as it fills the gap left by the non-existent union catalog for Germany.

...has become indispensable.

...an indispensable tool for my daily work.

... a wonderful aid.

...the only way I know of to check whether a book I want is available in a German library and can therefore be ordered via interlibrary loan.

... a great reference work ... a very important tool that makes my work much easier.

... the all-rounder for interlibrary loan searches

... a great and valuable tool for my work as an author

...an indispensable work tool.

...irreplaceable when working in the library

... the gateway to the world of literature, because I live in the provinces.

... simply indispensable, like a control center for my daily work.

... indispensable.

... useful

a useful tool

The KVnutzlichK is ... irreplaceable for me

... a daily work tool for cataloging in a public library.

... indispensable.

... makes my work much easier!

... a reliable source for checking bibliographic information.

... an important part of my work. Indispensable!

...

... an ingenious tool that has helped me personally enormously with scientific documentation for over 25 years and is just as helpful in my voluntary work. This involves the targeted acquisition of new and antiquarian titles for the Transylvanian Library in Gundelsheim in a context where only donations are available. With the KVK portal on my cell phone, I can check at any time to what extent the relevance of each publication that appears on a book market or in an antiquarian bookshop in Romania is primary or merely secondary. The KVK portal thus makes an enormously important contribution to the targeted use of scarce resources and to keeping the number of self-cataloged items in the Transylvanian Library at an incomparably high level. Keep up the good work!

... a great relief of work!

... a great support in the daily work.

indispensable!

... a wonderful finding aid that I wouldn't want to do without.

... the most important tool for finding bibliographic information on a book.

... an important working tool.

... an indispensable aid for daily library work.

... a valuable source for researching, across all associations and countries. Thank you for the reliable provision over three decades!

A very special and useful tool for my job as a librarian.

...the library catalog of library catalogs.

...a very good and important working tool.

... a working tool. I mainly use it to research the subject indexing of titles.

... the easiest way to research library holdings.

...indispensable!

...an indispensable research tool

... worth its weight in gold

... a terrific, irreplaceable research tool that has accompanied me faithfully since its beginnings and always offers new and unexpected bibliographic finds (often also as a suggestion for acquisition in the home library). Congratulations on your anniversary and good luck for the future!

...the most important library catalog especially for German books worldwide.

good

... an indispensable research tool

... a good tool

... a serious and reliable source of information

...We use it a lot in the Interlibrary Loan service of the Xeral Library of the University of Santiago de Compostela

Essential tool for the work of a librarian

... universal aid

... indispensable.

... a research tool

... a search engine

... a constant, cherished tool.

...an important aid, especially when searching for digital editions of historical books.

...is a search engine

... a blessing

... priceless

... always a source of knowledge and research.

... a guiding star in my daily work.

... indispensableCongratulations on this great and helpful catalog!

In many ways a very important tool for my work.

... a research tool that makes my work easier

... indispensable!

... very helpful in everyday library work... an indispensable, gratefully used instrument in the preparation, supplementation and new edition of the book Christian Gotthilf Salzmann - eine Bibliographie in zwei Teilen im Garamond. The science publisher 2022. I also research literature on my topics for specific occasions - also internationally.

... a very good tool.

... the best tool for finding the titles you want in the confusion of the journals! I have been working regularly with the KVK since 2006 and am very grateful that it exists!

... a very good and helpful bibliographic tool.

... a very important tool on a daily basis.

... an important tool in my daily work.

... a treasure trove of literature references and literature networks.

... an essential research tool

... access to literature - even off the beaten track and old literature.

... an important and indispensable working tool.

... an indispensable tool for my scientific research. I have been using it to search my literature since my studies and have always initiated my research with a KVK search. Even the most remote titles, which would otherwise have remained hidden, can be tracked down worldwide with it, so that I have been able to contact the relevant organizations, if I have not even found the reference to a previously unknown digitalization and thus direct access.

The existence of the KVK has, if not made my research possible at all, then definitely enriched and rounded it off considerably, and I wouldn't know how I could manage without it!

... a useful tool to support me in my work in the library!

... unique and almost irreplaceable due to its unique selling point in terms of information technology.

...the most important tool for my bibliographic research

...indispensable

... great

... simply valuable!

...an essential research tool

... fast and useful.

...a great help in literature research

... an important research tool.

... a comprehensive research tool

... an ideal addition to the working day

... a useful tool

... a reliable companion at work for three decades

... the first port of call for my literature research for 30 years!

Access to knowledge

an important and solid reference base.

... the central library catalog

... an essential tool for interlibrary loans

... practical

...a great help and a treasure chest.

... a valuable part of my library work.

KVK is very important for professional use. I am a librarian in Paris. I catalog the German legal holdings in the inter-university library Cujas.

... the most important tool for literature research!

...very useful

but now I want to do some research

... always a good address for cataloging 16th and 17th century prints, as well as for processing complicated interlibrary loans! The KVK facilitates research enormously and prevents time-consuming individual searches! Thank you for the offer!

...outstanding, indispensable and absolutely necessary for academic work.

... a very important tool for my work and a companion for many, many years.

... the decisive platform for searching for books in a specific field. ... a great help for literature research

... indispensable

... indispensable

... an indispensable tool for scientific research

Often a lifebuoy in the sea of literature

... indispensable

... the platform that might still be able to help me when all else has failed.

... an important tool for checking bibliographic information and finding out about the availability of books and articles.

... an important tool for my daily work! Thank you <3

... an important research tool

An irreplaceable tool.

... an important research tool.

... a great help

...the way to the books

... indispensable and irreplaceable.

... rock in the surf, reliable reference, inexhaustible source for your own work (and credentials for its distribution, keyword VG Wort)

... an indispensable working tool

... increasingly difficult to use, confusing and EXTREMELY slow. An indictment in the course of development.

... an important research tool, but in need of improvement.

... indispensable.

... like a single international library on my desk. For the pensioner living in the country, it provides an elegant insight into all titles and opens the door to the growing digital holdings via a secret route. So it doesn't fit in with the history of often abandoned or long-winded projects in academic librarianship! Congratulations!

... indispensable

... an irreplaceable working tool

... the most important bibliographical aid for my legal-historical work since 1998 (the beginning of my dissertation, doctoral thesis).

... the indispensable central point of contact for literature searches, which I always recommend to students.

Since the KVK is also my central point of contact for clarifying where a title is available, it would be very pleasing if in future the holdings of the many small libraries could be searched again, which for some inexplicable reason dropped out of the KVK search results some time ago. After all, it is sometimes quicker to consult a book in a nearby specialist library than to order it via interlibrary loan. In addition, researchers should be able to access the diversity and enormous depth of German library collections easily and simply via a central search.

I would like to thank everyone involved for their commitment!

... essential. I cannot and will not do without it.

It occurs to me that the link to Amazon.de, German books no longer works. Can you fix this problem? Thank you very much.

... an indispensable database

... a great tool, a door into the world of books available in libraries worldwide. Won't miss it!

Happy 30th birthday!!!!

... indispensable!!! A milestone in librarianship!

... a wonderful search engine for correct title search and title checking especially for image and print research in Europe

sometimes a lifesaver when searching for a book

... the most important aid for correct citation, e.g. for noting first publications.

... a central working tool.

... good.

Everyday life

... a good source for finding books.

... a wonderful research tool with an almost 100% guarantee of success... an important source for research

... an important guide to subject-related specialist literature

... essential for my work as a historian.

... a great help when I, as a library reference librarian, am keywording complicated publications and can check whether and how someone from another library network has already keyworded the same title.

In the private Division, my husband and I use KVK to check which library in our area does not have a rare title in its collection so that we can ask them specifically whether they would like to receive a book donation from us (we are currently reducing our private library).

... the first choice when it comes to literature research!

... central

... a very good tool for identifying books

... a valuable working tool for bibliophile research

... irreplaceable.

...indispensable.

Very good catalog, on the same level as USTC!

...super

... one of the most reliable research tools I know

... the first access point for my research for decades

... a revolutionary achievement that has made research for scientific purposes easier in a groundbreaking way.

... brilliant! I regularly introduce KVK to my students. Ad multos annos!

... a very useful tool for many years, which has made many research tasks and literature acquisitions much easier. Thank you very much!

... the most important medium for researching academic literature and locating it in libraries.

... super

... helpful, as several catalogs are checked simultaneously with one query, which makes the literature search quick and effective.

... indispensable

The KVK is the tool that searches a variety of catalogs and thus speeds up and simplifies the user's search.

... an irreplaceable search instrument.

... a great gift and at the same time still very expandable in terms of ease of use

... indispensable

... research tool

... the first port of call when searching for scientific literature.

... an important tool for identifying scientific literature

...indispensable

... an indispensable working tool.

... - political scientist and historian - one of the most important research tools for my work. I can search quickly, thoroughly and conveniently for different editions of titles and buy them cheaply - if available - in antiquarian bookshops.

... the place where I can find all the information I need for my literature research.

... a great help.

... an indispensable tool for scientific work

if it didn't exist yet, it would have to be invented urgently

KVK is extremely important and a great help for librarians. Congratulations on your anniversary!

... a very important tool in everyday work :-)

... a huge treasure chest.

... an indispensable aid in my work as an old collection librarian when I am looking for digital copies or want to get an overview of several editions of a text.

... the most important tool in my training

...... is living proof that science is possible.

... an important aid in my voluntary work.

... very good

valuable

... very useful

... a perfect research tool.

... quite important as a first point of contact; I appreciate the timeliness and speed of the results. Thank you very much for your work!!!

... indispensable tool.

I am a librarian from the reference service of the university library. ... a very important and useful source of information.

... a professional companion for 30 years to find media in libraries at home and abroad and in bookshops.

... an interesting tool

... a successful reference work with a large amount of data from various libraries, easy to query.

... an important working tool

... one of the best catalogs

the best research tool available in the German-speaking world

... indispensable.

... an ingenious invention and an indispensable aid.

... an irreplaceable and extremely valuable working tool.

... perfect

... immensely important, uninsurable.

... perfect

... INDISPENSABLE

... absolutely irreplaceable.

... an indispensable work tool

...good, if not for annoying surveys. No time.

... essential!

... indispensable - my job as a second-hand bookseller

...useful, if not for annoying surveys. Please no more annoyances of this kind.

... the lifeline of various specialized, scientific, subject-related scientific disciplines right on my desk. And a great opportunity to browse - also right on my desk and on the go.

... worth its weight in gold because it searches several collections simultaneously, offers me digital media when they are available and can otherwise connect me directly to the library of my choice.

... an indispensable research tool that always has an answer where others fail.

... very good

... the central research portal for finding titles that are otherwise difficult to locate.

... a fantastic working tool (I am a librarian)

... research tool that is very helpful for my studies.

...a part of my work

...an indispensable, vital work tool!

... a very important work tool and supports me very well in my daily cataloging work!

... very useful

... an important tool.

... an indispensable research instrument

... a tool that is indispensable for library work and I wouldn't want to be without it!

... Trick 17, when I get stuck with DigiBib and then find the media after all.

Directly to the KVK