Former Owner
- Charles E. Roseman Jr.1
- Charles Hurleston1
- Charles Kothen1
- Charles Marriette1
- Charles Singer1
- Charles Stephen Ascherson1
- Chartreuse Saint-Sixte de Rettel1
- Claude Augustin de Cosson1
- Clemente Carilli1
- Collegium Germanicum et Hungaricum1
- Cornelius John Hauck1
- Cristoferus Chrewczer1
- D. Andreas Parisino1
- Dean Putnam Lockwood1
- Dionysiĭ Vasilevich1
- Donaueschingen court library1
- Duncan Beresford-Jones1
- Edmund Newman1
- Edward Cheney1
- Edward Samuel Dewick1