Former Owner
- Antonio Ubaldini1
- Antonius Mensing1
- Arno M. Voynich1
- Artemesia Piccolomini1
- Arthur Vershbow1
- Assemani family1
- Barbarigo family1
- Bartolomeo Amici1
- Basilica of Sant'Ambrogio1
- Beatrice de Fouar1
- Beatus Rhenanus1
- Benetto Spinelli1
- Bernardo Bembo1
- Biblioteca Trivulziana1
- Breslauer and Meyer1
- Brick Row Book Shop1
- Bruce P. Ferrini1
- Burndy Library1
- Byron Reed1
- C. Bruscoli1