Former Owner
- Abū al-Ḥasan Dallāl1
- Achille Genty1
- Achille Kühnholtz-Lordat1
- Acquired before February 1992 and probably in library for many decades.1
- Acton Griscom6
- Ada E. Moorhead Thomas1
- Ada Thurston1
- Adalbert von Lanna1
- Adam Clarke3
- Adam Samuel Thebesius1
- Adam Sim1
- Adam Weinberger Rare Books1
- Adam de Campigny1
- Adelbert Brownlow-Cust, 3rd Earl Brownlow1
- Adelrich Benziger1
- Admont Abbey4
- Admont Abbey Library5
- Adolph Sutro21
- Adolphe Lefrancq1
- Adolphe Morlot1