Former Owner
- Joseph-Félix Allard2
- Julia Burgess2
- Karen L. Gould1
- Karl F. Morrison1
- Katherine Somerset Wyttenbach Fenwick1
- Lambach Abbey2
- Lathrop Colgate Harper3
- Laurence William Hodson2
- Lawrence J. Schoenberg5
- LeMare1
- Leicester Harmsworth1
- Leo Olschki1
- Lepeletier de Rosanbo1
- Library of the Dominicans of Paris1
- Linda Ehrsam Voigts1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Luigi Celotti1
- M. Haimmiller1
- Magby, H1
- Maggs Bros Ltd3