Former Owner
- Pierre Pithou2
- Pius VI2
- Prieuré Saint-Louis de Poissy2
- R. Stora and Company2
- Rabbinical Seminary Vienna2
- Raoul Chandon de Briailles2
- Raymond Berriot2
- Richard Gough2
- Robert Forrer2
- Robert Mignan2
- Rosamond B. Loring2
- Ross Winans2
- Rudolf Busch2
- Rushton Mather Dorman2
- Sam Fogg Rare Books & Manuscripts2
- Samuel Claggett Chew2
- Samuel Whitaker Pennypacker2
- San Giorgio Monastery2
- San Pietro Apostolo2
- San Sisto, Piacenza2