(FirstSearch) - The world's most comprehensive bibliography, with more than 55 million bibliographic records representing over 400 languages on materials ranging from stone tables to electronic books. WorldCat includes information from 2100 BC to the present with thousands of records containing evaluative content such as tables of contents, cover art, book summaries and notes about the authors. It uses the Library of Congress Subject Headings as its thesaurus. Users can also directly browse issues of periodicals in the ArticleFirst database from bibliographic records for these titles in WorldCat. WorldCat adds value to other databases in FirstSearch by linking citations to holdings that help users find these materials in their own libraries and to the Interlibrary Loan service. Updated daily.