1From Benjamin Franklin to Humphry Marshall, 9 July 1769 (Franklin Papers)
ALS : Mr. S. Hallock du Pont (1955) I received your obliging Favour of April 13. with Specimens...
2From Benjamin Franklin to Humphry Marshall, 18 March 1770 (Franklin Papers)
ALS : Yale University Library I was duly favoured with yours of Oct. 30, and glad to hear that...
3From Benjamin Franklin to Humphry Marshall, 22 April 1771 (Franklin Papers)
ALS : Yale University Library I duly received your Favours of the 4th. of October and the 17th....
4From Benjamin Franklin to Humphry Marshall, 20 March 1772 (Franklin Papers)
ALS : Yale University Library I received your obliging Letter of Nov. 27. It was forwarded to me...
5From Benjamin Franklin to Humphry Marshall, 14 February 1773 (Franklin Papers)
ALS : Yale University Library; letterbook draft: Library of Congress A considerable Time after...
6From Benjamin Franklin to Humphry Marshall, 26 June 1774 (Franklin Papers)
ALS : Gray Herbarium, Harvard University I received and am obliged by your Favour of May 14, in...
7From Benjamin Franklin to Humphry Marshall, 13 March 1775 (Franklin Papers)
AL : Yale University Library I duly receiv’d your Favour of Novr. the 26th, but having mislaid...
8From Benjamin Franklin to Humphry Marshall, 23 May 1775 (Franklin Papers)
Reprinted from William Darlington, Memorials of John Bartram and Humphry Marshall . . ....