The world's most comprehensive bibliography, with more than 86 million bibliographic records and nearly 1.2 billion holdings representing the collections of more than 10,000 libraries, over 400 languages, and all types of materials ranging from stone tablets to electronic books. WorldCat is updated daily and is now easier to search than ever.
Recent enhancements include the ability to search by Library of Congress or Dewey Decimal Classification numbers, and to limit searches by material types, audiences and material formats. WorldCat includes information from before 1,000 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 and several other terminologies as its thesauri.