Former Owner
- Artemesia Piccolomini1
- Arthur M. Ellis1
- Ashridge Priory1
- Aḥmad al-Mudarris1
- 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
- Bernard M. Rosenthal1
- Bernardo Bembo1
- Beverly Chew1
- Biblioteca Trivulziana1
- Branners Bibliofile Antikvariat1
- Brian Douglas Stilwell1
- Brick Row Book Shop1
- Byron Reed1