Former Owner
- Philadelphia Rare Books & Manuscripts Company1
- Philip Hofer1
- Philip Hurd1
- Philip van Alfen1
- Philippe Hurault de Cheverny1
- Phillip J. Pirages Fine Books & Manuscripts1
- Pierre Gélis-Didot1
- Québriac family1
- René Antoine Thoué1
- Robert H. Sayre1
- Rudolf Busch1
- Rush Hawkins1
- Ruth Cheney Streeter1
- Sabin1
- Saluti, Tomasso, active 20th century1
- Samuel Whitaker Pennypacker1
- Sandbergs Bokhandel1
- Sebastienne Boscher1
- Sir Henry St John-Mildmay, 4th Baronet1
- Sir John Peachey1