Former Owner
- Pietro Canal1
- Pietro Civaleri1
- Pietro Giometti1
- Pietro Millini1
- Pietro Odescalchi1
- Prince Augustus Frederick, Duke of Sussex1
- Raphael de Mediolano1
- Renzo Rizzi libri antichi1
- Richard Bennett1
- Rinaldo Ridolfini1
- Robert Oppenheim1
- Robert S. Pirie1
- Robert Villareal1
- Roger Martin1
- Ross Winans1
- Rudolf Graupner1
- Rush Hawkins1
- Ruth E. Adomeit1
- Ruth Fowler Jarvis1
- Saint Joseph's Seminary1