Former Owner
- Norman H. Strouse1
- Otto Ege9
- P. Pigeot1
- Paolo Vimercati Sozzi1
- Paul Gottschalk1
- Peter Ludwig1
- Petrus Giraud1
- Petrus Jensenius1
- Petrus Ysermans1
- Philip C. Duschnes1
- Phillip J. Pirages Fine Books & Manuscripts1
- Prieuré Saint-Louis de Poissy1
- Prince Augustus Frederick, Duke of Sussex1
- R. J. Bunck1
- Rashīdī, Ibrāhīm ibn Yūsuf1
- Robert Brodhead Honeyman1
- Robert Garrett1
- Robert Hoe III5
- Robert Manning Strozier Library1
- Robert Williams1