1From Benjamin Franklin to John Winthrop, 8 April 1761 (Franklin Papers)
ALS : American Philosophical Society I did myself the Honour of writing you a few Lines the 20th...
2To 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...
3To Benjamin Franklin from John Winthrop, 29 September 1762 (Franklin Papers)
MS not found; reprinted from Benjamin Franklin, Experiments and Observations on Electricity...
4From Benjamin Franklin to John Winthrop, 23 December 1762 (Franklin Papers)
MS not found; reprinted from American Autograph Shop, American Clipper (Merion Station, Pa.),...
5From Benjamin Franklin to John Winthrop, 10 July 1764 (Franklin Papers)
ALS : Harvard College Library I received your Favour of the 12th. past, and congratulate you on...
6To Benjamin Franklin from John Winthrop, 6 January 1768 (Franklin Papers)
Printed from extract in Benjamin Franklin, Experiments and Observations on Electricity, Made at...
7From Benjamin Franklin to John Winthrop, 2 July 1768 (Franklin Papers)
Reprinted from William Temple Franklin, ed., Memoirs of the Life and Writings of Benjamin...
8From Benjamin Franklin to John Winthrop, 11 March 1769 (Franklin Papers)
ALS : American Philosophical Society At length after much Delay and Difficulty I have been able...
9To 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...
10From Benjamin Franklin to John Winthrop, 6 June 1770 (Franklin Papers)
ALS : Massachusetts Historical Society I find among my Papers a Letter of yours, dated Dec. 7....