WorldCat This link opens in a new windowWorldCat (of which TU's Discovery is a part) contains all the records cataloged by OCLC member libraries, making it the largest database of library holdings in the world. More than 290,000,000 bibliographic records, representing more than 2,000,000,000 holdings from over 72,000 libraries in 170 countries with materials in over 470 languages, make up the database. It includes not only books, but also software, manuscripts, films, slides, music scores, newspapers, journals, videorecordings, magazines, and more.