Former Owner
- J. & J. Leighton1
- Jacob Dackomb1
- Jacques Rosenthal1
- James & Mary Lee Tregaskis (Firm)1
- Johan C. Jackson1
- Johannes Patou1
- John Eliot Hodgkin1
- John Estmond1
- John Ives1
- Joseph E. Widener1
- Ludwig Rosenthal1
- Luigi Arrigoni1
- Maggs Bros Ltd1
- Maksymilian Mielzynski1
- Mannheimer Hofbibliothek1
- Marchese Linterno1
- Marie-François Duchesne de Beaumanoir1
- Percy Mordaunt Barnard1
- Preston A. Perry1
- Richard Hooker1