Former Owner
- Philippe Desportes1
- Phoebe Hearst1
- Pierre Fraenkel1
- Pierre Gorman1
- Pierre Pithou1
- Pietro Antonio Crevenna1
- Pietro Bembo1
- Pius XI1
- Poblet Monastery1
- Poor Clares1
- Preston A. Perry1
- Québriac family1
- R. F. Pain1
- R. H. Fenn1
- RR Donnelley1
- Rabbinical Seminary Vienna1
- Ramón de Mesonero Romanos1
- Raoul Chandon de Briailles1
- Renzo Rizzi libri antichi1
- Rev. J. Duncalf1