WorldCat Interconnected and Integrated Catalogue Database
WorldCat interconnected and integrated catalogue database is the world’s largest catalogue database, including the catalogue entry and stock information of about 20,000 members of OCLC. Since established in 1971, the stock information has amounted to more than 2.5 billion in 491 languages and the catalogue information has amounted to 380 million, reflecting all the books and other materials from 4,800 BC to the present and the fruits of the knowledge of the human kind in the past 4,000 years. The literature in this database is of various types, including books, manuscripts, maps, websites and internet resources, music scripts, videos, newspapers, journals and magazines, article and documents. The database is updated every ten seconds.