Former Owner
- 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
- Robert H. Sayre1
- Rudolf Busch1
- Rush Hawkins1
- Ruth Cheney Streeter1
- Sabin1
- Sabina Sopheija Behren1