Former Owner
- Oliver R. Barrett1
- Otto Ege38
- Otto Orren Fisher1
- P. Desq1
- Park Abbey1
- Parke-Bernet1
- Paul Gruel1
- Paul Riant1
- Peter Arrell Brown Widener II1
- Philip C. Duschnes1
- Philip Sills1
- Phillip J. Pirages Fine Books & Manuscripts3
- Prince Augustus Frederick, Duke of Sussex2
- RR Donnelley1
- Rashīdī, Ibrāhīm1
- Rashīdī, Ibrāhīm ibn Yūsuf2
- Rev. T. Barnes1
- Ricardo Herdia, active 18911
- Richard Griffith1
- Richard Hooker1