Former Owner
- Nancy McGrath1
- Nicholas Herry1
- Oliver Henry Perkins1
- Oliver R. Barrett1
- Otto Ege25
- Otto Orren Fisher1
- P. Desq1
- Park Abbey1
- Parke-Bernet1
- 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
- Rev. T. Barnes1
- Richard Griffith1
- Richard Hooker1
- Richard Legh1