Former Owner
- Ashridge Priory1
- Aytmish al-Bajasī, Amīr, -14001
- Aḥmad Rifʻat ibn al-Ḥājj Muḥammad Fākhir Z̤amāqavī1
- B.S. Cron1
- Baldasarre Boncompagni1
- Barbarigo family1
- Barbe de Laon1
- Basilica of Sant'Ambrogio1
- Beatrice de Fouar1
- Beauvais Cathedral1
- Benoît Le Court1
- Bentley Lyonel John Tollemache, 3rd Baron Tollemache1
- Bergendal Collection1
- Bernard M. Rosenthal1
- Bernardo Bembo1
- Beverly Chew1
- Biblioteca Trivulziana1
- Branners Bibliofile Antikvariat1
- Brian Douglas Stilwell1
- Brick Row Book Shop1