1To Benjamin Franklin from David Hartley, 8 January 1780 (Franklin Papers)
ALS : American Philosophical Society I cannot imagine what has prevented my hearing from you for...
2To Benjamin Franklin from David Hartley, 5 January 1780 (Franklin Papers)
ALS : American Philosophical Society; transcript: Library of Congress I writ to you a day or two...
3To Benjamin Franklin from David Hartley, 16 November 1779 (Franklin Papers)
ALS : American Philosophical Society; transcript: Library of Congress The enclosed letter wch I...
4To Benjamin Franklin from David Hartley, 3 January 1780 (Franklin Papers)
ALS : American Philosophical Society; transcript: Library of Congress It is so long since I have...