Former Owner
- Otto Ege3
- Otto Haas1
- Paul Gottschalk1
- Paul Gruel1
- Paul Sabatier3
- Peter Le Neve2
- Petrus Hofstede1
- Philadelphia Rare Books & Manuscripts Company1
- Philip C. Duschnes1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hofer1
- Phillip J. Pirages Fine Books & Manuscripts2
- Pierre Pithou1
- Poor Clares1
- Québriac family1
- R. Stora and Company2
- Ramsau Monastery1
- Raoul Chandon de Briailles1
- Renzo Rizzi libri antichi1
- Richard Priestley1