Durham University Library manages the archives of Durham Cathedral.
Durham Cathedral Library, in the cathedral cloister, looks after the printed and other manuscript collections held by the cathedral (including the medieval book manuscripts)
List of Cathedral Library collections and catalogues available online
See http://www.durhamcathedral.co.uk/learning/the-cathedral-library/opening-hours-and-access for current information. It is recommended that you check availability and location before planning a visit.
For general information about Durham Cathedral see their website http://www.durhamcathedral.co.uk/
For information about visiting Durham Cathedral Library see http://www.durhamcathedral.co.uk/learning/the-cathedral-library