Former Owner
- Paul Gottschalk1
- Paul Sabatier1
- Petrus Hofstede1
- Philadelphia Rare Books & Manuscripts Company1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Kerr, 11th Marquess of Lothian1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts1
- Pietro Antonio Crevenna1
- Prieuré Saint-Louis de Poissy1
- Prince Augustus Frederick, Duke of Sussex1
- Quinton Edward Gurney1
- Québriac family1
- René Antoine Thoué1
- Ricardo, Conde de Benahavis Heredia1
- Richard Heber1
- Robert Garrett1
- Robert H. Sayre1
- Robert Lehman1
- Rushton Mather Dorman1