Union Catalogue – layout, compilation, available services;
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, including book format, microform, cards and more recently, networked electronic databases. Print union catalogs are typically arranged by title, author or subject (often employing a controlled vocabulary); electronic versions typically support keyword and Boolean queries.
Union catalogs are useful to librarians, as they assist in locating and requesting materials from other libraries through interlibrary loan service. They also allow researchers to search through collections to which they would not otherwise have access, such as manuscript collections.
The largest union catalog ever printed is the American National Union Catalog Pre-1956 Imprints (NUC), completed in 1981. This achievement has since been superseded by the creation of union catalogs in the form of electronic databases, of which the largest is OCLC‘s WorldCat. Another example is COPAC provided by Research Libraries UK, which was superseded by Library Hub Discover in 2019. A third example is AMICUS, provided by Library and Archives Canada.
For academic publications, several academic search engines exist to combine the open data provided by open archives through OAI-PMH, as well as records from publishers deposited in CrossRef and other sources. They include BASE, CORE and Unpaywall, which indexes over 20 million open access publications as of 2020.
- 1 - Knowledge Processing Basics
- 2 - Subject Cataloguing
- 3 - Library of Congress Subject Heading(LCSH)
- 4 - Sears List of Subject Heading
- 5 - Subject Cataloguing by Chain Procedure
- 6 - Cataloguing Policies and Standards
- 7 - Organization of Cataloguing Department
- 8 - Centralized and Co-operative Cataloguing
- 9 - Union Catalogue – layout, compilation, available services;
- 10 - Limited and selective cataloguing.
- 11 - Standardization of Bibliographic Description – ISBDs and Revised ISBD
- 12 - Content designators – Bibliographic formats (CCF/B, MARC 21, and UNIMARC) and Authority record formats (MARC 21 authority format);
- 13 - Union cataloguing activities – WorldCat of OCLC, RLIN, RedLightGreen, Union catalogues of INFLIBNET, DELNET etc;
- 14 - Cataloguing modules of library automation packages – Requirements, Features, Authority files etc
- 15 - Trends in cataloguing – IME/ICC principles, FRBR, FRAD, RDA, Bibliographic relationships, Web-OPAC