Former Owner
- Paul Gruel1
- Peter Le Neve1
- Petrus Hofstede1
- Pettini Libraria di Antonio Pettini1
- Philadelphia Rare Books & Manuscripts Company1
- Philip C. Duschnes1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hofer1
- Pierre Pithou1
- Quinton Edward Gurney1
- Québriac family1
- R. Stora and Company1
- Ramsau Monastery1
- Raoul Chandon de Briailles1
- Renzo Rizzi libri antichi1
- Robert Forrer1
- Robert de Hangest1
- Rudolf Busch1
- Rush Hawkins1
- Saint-Amand Abbey1