The OCLC union catalog, containing more than 43 million records describing books and other items owned by libraries around the world. Each record contains library holdings. WorldCat covers thousands of subjects and includes records for items as far back as 1000 B.C. Materials covered in the catalog include: books, internet resources, computer data files, computer programs, films, journals, magazines, manuscripts, maps, musical scores, newspapers, slides, sound recordings, and videotapes. WorldCat does not include individual article titles or stories in journals, magazines, newspapers, or book chapters.