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Online public access catalog. The online public access catalog (OPAC), now frequently synonymous with library catalog, is an online database of materials held by a library or group of libraries. Online catalogs have largely replaced the analog card catalogs previously used in libraries.
The Online Books Page lists over 2 million books [3] and has several features, such as A Celebration of Women Writers and Banned Books Online. The Online Books Page was the second substantial effort to catalog online texts, but the first to do so with the rigors required by library science. It first appeared on the Web in the summer of 1993.
United States. The Whole Internet User's Guide and Catalog, by Ed Krol, was published in September 1992 by O'Reilly. The Los Angeles Times notes that the Whole Internet User's Guide and Catalog was the "first popular book about the medium" and "was later selected by the New York Public Library as one of the most significant books of the 20th ...
The card catalog was a familiar sight to library users for generations, but it has been effectively replaced by the online public access catalog (OPAC). Some still refer to the online catalog as a "card catalog". [2] Some libraries with OPAC access still have card catalogs on site, but these are now strictly a secondary resource and are seldom ...
List of online encyclopedias. This is a list of well-known online encyclopedias that are accessible or formerly accessible on the Internet. The largest online encyclopedias are general reference works, though there are also many specialized ones. Some online encyclopedias are editions of a print encyclopedia, such as Encyclopædia Britannica ...
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The National Union Catalog (NUC) is a printed catalog of books catalogued by the Library of Congress and other American and Canadian libraries, issued beginning in the 1950s. The National Union Catalog is divided into two series: the Pre-1956 Imprints is a 754-volume set containing all older records in a consolidated alphabetical format, while ...
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