The Bodleian Library houses the largest collection of pre-1500 printed books in a university library, and the fifth largest collection of incunabula in any library in the world: 5623 editions in 6755 copies.
Information about the history of the Bodleian’s incunable collections, their housing, and cataloguing may be found in Alan Coates, ‘The Bodleian Library and its Incunabula’.