Former Owner
- Peter Arrell Brown Widener1
- Petrus Hofstede1
- Philibert-Charles-Marie Varenne de Fenille1
- Philip C. Duschnes1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hofer1
- Philip Hurd1
- Philippe Desportes1
- Philippe Hurault de Cheverny1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts1
- Phyllis Walter Goodhart Gordan1
- Pierleone Leoni1
- Pierre Gélis-Didot1
- Pierre Pithou1
- Pietro Antonio Crevenna1
- Prieuré Saint-Louis de Poissy1
- Québriac family1
- R. A. Godwin-Austen1
- R. Stora and Company1