Former Owner
- Michele Cavaleri2
- Otto Ege2
- Paul Riant2
- Peter Arrell Brown Widener2
- Peter Arrell Brown Widener II2
- Philip Kerr, 11th Marquess of Lothian2
- Phillip J. Pirages Fine Books & Manuscripts2
- Robert Forrer2
- Ross Winans2
- San Sisto, Piacenza2
- Sandbergs Bokhandel2
- Thomas Johnes2
- Thomas de Grey, 2nd Earl de Grey2
- Walter Paul Havens2
- Ward Murphey Canaday2
- Warren C. Crane2
- Wilfrid Voynich2
- William Bateman2
- William H. Schab2
- William Horatio Crawford2