Former Owner
- André Rooryck1
- Anne de Graville1
- Arnold Mettler1
- Arthur Annesley, 1st Earl of Anglesey1
- Arthur Brölemann1
- Ashton Lever1
- Auburn Theological Seminary1
- Aulne Abbey1
- Aḥmad al-Mudarris1
- Baldassarre Boncompagni1
- Bartholus Blancellus1
- Battle Abbey1
- Benjamin Heywood Bright1
- Bern Dibner1
- Bernard M. Rosenthal1
- Bernard Serrigny1
- Bernardo Bembo1
- Bertram Dobell1
- Betty Freudenheim1
- Bibliotheca Philosophica Hermetica1