Former Owner
- Bernard Quaritch Ltd1
- Betty Freudenheim1
- Bhaṭṭaṃbhaṭṭa1
- Biblioteca Trivulziana1
- Bibliotheca Philosophica Hermetica1
- Boies Penrose1
- Boies Penrose II1
- Breslauer and Meyer1
- Bristol Baptist College1
- Brudenell family1
- Budapest University of Jewish Studies1
- Burg Kreuzenstein1
- Burndy Library1
- Buxheim Charterhouse1
- Byron Reed1
- C.B1
- Caesareum Societatis Jesu Collegium Viennense1
- Carleton Rubira Richmond1
- Carlos José Gutiérrez de los Ríos y Rohan Chabot Fernán-Núñez1
- Catharine Wisser1