41To Benjamin Franklin from Isaac Norris, 19 October 1761 (Franklin Papers)
Letterbook copy: Historical Society of Pennsylvania I find my Last of the 30th of September mist...
42To Benjamin Franklin from Isaac Norris, 4 November 1761 (Franklin Papers)
Letterbook copy: Historical Society of Pennsylvania I sent by Captain Hervey bound to Hollyhead...
43To Benjamin Franklin from Isaac Norris, 16 November 1761 (Franklin Papers)
Letterbook copy: Historical Society of Pennsylvania Benja. Franklin By Captn. Bradford } Infra...
44To Benjamin Franklin from Isaac Norris, 18 May 1765 (Franklin Papers)
ALS : American Philosophical Society; letterbook copy: Historical Society of Pennsylvania I...