WHAT BOOK?

Usually I search the Library of Congress or the British Library or the Royal Library in Copenhagen to find a rare book - now through OPAC there is a world wide UNION CATALOGUE called WORLDCAT
http://www.oclc.org/worldcat/

Frederick G. Kilgour (1914–2006)

Frederick G. Kilgour, a librarian and educator who created an international computer library network and database that changed the way people use libraries, died on July 31, 2006. He was 92 years old and had lived since 1990 in Chapel Hill, North Carolina.

Kilgour is widely recognized as one of the leading figures in 20th century librarianship for his work in using computer networks to increase access to information in libraries around the world. He was among the earliest proponents of adapting computer technology to library processes. At the dawn of library automation in the early 1970’s, he founded OCLC Online Computer Library Center and led the creation of a library network that today links 55,000 institutions in 110 countries.

WorldCat is provided by OCLC Online Computer Library Center, Inc. on behalf of its member libraries.

WorldCat lets a wider audience discover items in your OPAC and find your online services when they follow links from results on popular Web search engines (like Google and Yahoo!), other partner sites or WorldCat.org. More than just a database of things libraries own, WorldCat is the foundation for an array of online services that help libraries manage those things and the processes behind them. By putting common workflows such as cataloging and resource sharing onto a collaborative network driven by WorldCat data, libraries make the most of their resources, staff and budget.

Find in a Library" links people broadly searching the Web from popular search, bookselling and bibliography sites to the resources of local libraries. The collections of libraries that contribute cataloging or holdings information to WorldCat—the world's most comprehensive database of library-held items and the core of the OCLC cooperative—are exposed to users on the open Web at the sites where many begin their online searches for information.

Learn more about the "Open WorldCat" program

Update your library's Open WorldCat links

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WebJunction
WebJunction is an online community where library staff meet to share ideas, solve problems, take online courses and have fun. Join us! Registration is free.

WorldCat Services login
Access your FirstSearch, WorldCat Resource Sharing and other OCLC library services administrative accounts.

NetLibrary
NetLibrary provides libraries with easily implemented electronic content solutions that support Web-based research, reference and learning in more than 12,000 libraries worldwide.