Former Owner
- John Fenn1
- John Frederick Lewis1
- John Towneley1
- Joseph Anton Koch1
- Joseph Ernst Koch-Sternfeld1
- Joseph Halle Schaffner1
- Juan Antonio de la Reguera1
- Juan Burgueño1
- Juan de Gayferos de Eguiraum1
- Juana I of Castile1
- Julian Burgueño1
- Katherine Somerset Wyttenbach Fenwick1
- Lady Frances Bentinck1
- Lambach Abbey1
- Laurence Claiborne Witten II1
- Leonard Baskin1
- Leopold Gruber1
- Libreria antiquaria Mediolanum1
- Libreria la Bibliofila1
- Lisa Unger Baskin1