BASE is one of the world’s most voluminous search engines, especially for academic web resources. BASE provides more than 150 million documents from more than 7,000 sources. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library.

ProQuest is a key partner for content holders of all types, preserving and enabling access to their rich and varied information. Those partnerships have built a growing content collection that now encompasses 90,000 authoritative sources, 6 billion digital pages and spans six centuries. It includes the world’s largest collection of dissertations and theses; 20 million pages and three centuries of global, national, regional and specialty newspapers; more than 450,000 ebooks; rich aggregated collections of the world’s most important scholarly journals and periodicals; and unique vaults of digitized historical collections from great libraries and museums, as well as organizations as varied as the Royal Archives, the Associated Press and the National Association for the Advancement of Colored People.