Former Owner
- Paul Riant2
- Peter Arrell Brown Widener2
- Peter Arrell Brown Widener II2
- Philip Kerr, 11th Marquess of Lothian2
- Phillip J. Pirages Fine Books & Manuscripts2
- Robert Brodhead Honeyman2
- Robert Mignan2
- Ross Winans2
- San Sisto, Piacenza2
- Sandbergs Bokhandel2
- Swarthmore College2
- Thomas Johnes2
- Typographic Library and Museum2
- Walter Paul Havens2
- Ward Murphey Canaday2
- Warren C. Crane2
- Wilfrid Voynich2
- William Bateman2
- William H. Schab2
- A. Beijan1