- Union catalog
A union catalog is a combined
library catalog describing the collections of a number of libraries. Union catalogs have been created in a range of media, includingbook format,microform , cards and more recently, networked electronicdatabases . Print union catalogs are typically arranged by title, author or subject (often employing acontrolled vocabulary ); electronic versions typically support keyword and Boolean queries.Union catalogs are useful to
librarian s, as they assist in locating and requesting materials from other libraries throughinterlibrary loan service. They also allow researchers to search through collections to which they would not otherwise have access, such asmanuscript collections.The largest print union catalog ever published is the American "National Union Catalog Pre-1956 Imprints" (NUC), completed in
1981 [cite journal
last = Beall
first = Jeffrey
coauthors = Kafadar, Karen
title = The Proportion of NUC Pre-56 Titles Represented in OCLC WorldCat
journal = College & Research Libraries
volume = 66
issue = 5
pages = 431–5
date = 2005
url = http://www.ala.org/ala/acrl/acrlpubs/crljournal/backissues2005a/crlsept05/beall05.pdf
accessdate = 2006-10-27 ] . This achievement has since been superseded by the creation of large electronic resource sharing networks, such as OCLC'sWorldCat .References
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