Former Owner
- Petrus Hofstede1
- Petrus de Thureyo1
- Pettini Libraria di Antonio Pettini1
- Philadelphia Rare Books & Manuscripts Company1
- Philibert-Charles-Marie Varenne de Fenille1
- Philip C. Duschnes1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hofer1
- Pietro Canal1
- Pietro Giometti1
- Pius VI1
- Prince Augustus Frederick, Duke of Sussex1
- Quinton Edward Gurney1
- Québriac family1
- R. J. Bunck1
- R. Stora and Company1
- Raoul Chandon de Briailles1
- Raymond Berriot1
- Reginald Cholmondeley1
- Renzo Rizzi libri antichi1