Former Owner
- B.S. Cron1
- Baldassarre Boncompagni1
- Basilica of Sant'Ambrogio1
- Benetto Spinelli1
- Bernard Quaritch Ltd1
- Bertram Ashburnham, 4th Earl of Ashburnham1
- Biblioteca Bottigella1
- Biblioteca Trivulziana1
- Bill McGrath1
- Bill Ward1
- Birgittinessenklooster Mariënwater1
- Bonhams & Butterfield1
- Breslauer and Meyer1
- Bridgewater Library1
- Bristol Baptist College1
- Bruce P. Ferrini1
- Byron Reed1
- Būtū ʻAbd al-Bāqī1
- C. Bruscoli1
- Camilla Doria Pallavicini1