Former Owner
- Paul Louis Feiss1
- Peter Arrell Brown Widener II1
- Peter Le Neve1
- Petrus Hofstede1
- Petrus Jensenius1
- Petrus Ysermans1
- Philadelphia Rare Books & Manuscripts Company1
- Philip Hofer1
- Philip Hurd1
- Philip Kerr, 11th Marquess of Lothian1
- Philippe Hurault de Cheverny1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts1
- Pierre Gélis-Didot1
- Québriac family1
- R. A. Godwin-Austen1
- Raoul Léonor Lignerolles1
- René Antoine Thoué1
- Rev. Frederick Collins Wilson1
- Ricardo, Conde de Benahavis Heredia1