Former Owner
- Philip C. Duschnes Rare Books & First Editions1
- Philip Kerr, 11th Marquess of Lothian1
- Philip van Alfen1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts1
- Pietro Odescalchi1
- Pius XI1
- Québriac family1
- R. A. Godwin-Austen1
- R. F. Pain1
- R. Stora and Company1
- Renzo Rizzi libri antichi1
- Rev. Frederick Collins Wilson1
- Ricardo, Conde de Benahavis Heredia1
- Richard Blount1
- Riddagshausen Abbey1
- Robert Charles Winthrop1
- Robert Forrer1
- Robert Williams1
- Robert de Mol1