In the medieval era, the primary places for the circulation of both books and ideas were the universities of Europe—and among the foremost was the University of Oxford. Through complicated networks of acquisition and exchange, the colleges of Oxford bought, borrowed, copied, and inherited major collections of one-of-a-kind books and manuscripts for the use of their fellows. They quickly built libraries to house them securely, and some colleges still retain remnants of those medieval collections. This latest volume in the Corpus of British Medieveal Library Catalogues series collects for the first time all the extant medieval documents that refer to library holdings in both Oxford University itself and its colleges in the medieval period. It will be an invaluable resource for those studying the history of the publication and circulation of ideas and the history of education.