WorldCat is a mega-library catalog containing more than 100 million records contributed by 20,000 libraries around the world. It contains full bibliographic descriptions and cataloging information for the following types of materials: books, serials, manuscripts, sound recordings, audiovisual materials, maps, music scores, and computer-readable files (Note: the database does not include information on individual articles, stories in journals, magazines, newspapers, or book chapters).

Leads to library cataloging records for books, serials, manuscripts, maps, computer-readable files, and audiovisual material.