Former Owner
- Abbey of St. Vaast2
- Abbot Raphael of Czerwinsk1
- Abbot von Heselwang1
- Abbé [Dourout]1
- Abraham Bracebridge1
- Abraham Pelunis1
- Achille Genty1
- Achille Kühnholtz-Lordat1
- Acquired before February 1992 and probably in library for many decades.1
- Acton Griscom5
- Ada E. Moorhead Thomas1
- Adam Clarke3
- Adam de Campigny1
- Adelbert Brownlow-Cust, 3rd Earl Brownlow1
- Adelrich Benziger1
- Admont Abbey2
- Admont Abbey Library3
- Adolphe Lefrancq1
- Adolphe Morlot1
- Adrian Van Sinderen1