1To Benjamin Franklin from John Winthrop, 4 March 1773 (Franklin Papers)
AL : American Philosophical Society I received your favor of Septr. 18. I return you many thanks...
2To Benjamin Franklin from John Winthrop, 28 March 1775 (Franklin Papers)
ALS : Massachusetts Historical Society I did my self the honor to write you, 13 Septr last, by...
3To Benjamin Franklin from John Winthrop, 6 January 1768 (Franklin Papers)
Printed from extract in Benjamin Franklin, Experiments and Observations on Electricity, Made at...
4To Benjamin Franklin from John Winthrop, 17 November 1761 (Franklin Papers)
Draft: American Philosophical Society I received your favor of 20 Feb. and 8 April last, the...
5To Benjamin Franklin from John Winthrop, 29 September 1762 (Franklin Papers)
MS not found; reprinted from Benjamin Franklin, Experiments and Observations on Electricity...
6To Benjamin Franklin from John Winthrop: On Observing the Transit of Venus, 6 September 1769 (Franklin Papers)
AL (extract): The Royal Society The observations of the transit of Venus in 1761 had not...
7To Benjamin Franklin from John Winthrop, 31 December 1773: extract (Franklin Papers)
Extract: Library of Congress I concur perfectly with you in the Sentiments expressed in your...
8To Benjamin Franklin from John Winthrop, 26 October 1770 (Franklin Papers)
Reprinted from the Massachusetts Historical Society Proceedings , XV (1878), 12–13. I received...