Former Owner
- Bartolomeo di Larione Martelli1
- Benetto Spinelli1
- Bernard Quaritch Ltd2
- Bernard Rosenthal1
- Bertram Ashburnham, 4th Earl of Ashburnham2
- Biblioteca Bottigella1
- Biblioteca Trivulziana1
- Bibliotheca Philosophica Hermetica1
- Breslauer and Meyer1
- Byron Reed1
- C. Bruscoli1
- Carleton Rubira Richmond1
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate1
- Carlo Longland1
- Carlo Morbio3
- Charles Burr1
- Charles Edward Harris-St. John1
- Charles Eliot Norton2
- Charles Fairfax Murray4
- Charles Joseph Harford1