Former Owner
- Antiquarian Books of Boston1
- Antoine Joseph Rérolle1
- Antoine de Court1
- Antoni Jerzy Apponyi1
- Antonio Assemani1
- Antonio Cánovas del Castillo1
- Antonio Dominico Restis1
- Antonio de Bonius1
- Antony Bek1
- Appiano family1
- Arnold Jansen op de Haar1
- Arthur Brölemann1
- Arthur Lee Loeb1
- Arthur Liddell, 5th Baron Ravensworth1
- Arthur M. Ellis1
- Ashridge Priory1
- Athelstan Riley1
- Austin, Jehan1
- B.C. Barker-Benfield1
- Baldasarre Boncompagni1