1From Benjamin Franklin to Peter Collinson, 28 March 1747 (Franklin Papers)
...the printed editions. This manuscript belongs to the American Academy of Arts and Sciences,...
2From Benjamin Franklin to Peter Collinson, 25 May 1747 (Franklin Papers)
Copy: American Academy of Arts and Sciences
3From Benjamin Franklin to Peter Collinson, 28 July 1747 (Franklin Papers)
Copy: American Academy of Arts and Sciences
4From Benjamin Franklin to Peter Collinson, 29 April 1749 (Franklin Papers)
Copy: American Academy of Arts and Sciences
5From Benjamin Franklin to John Mitchell, 29 April 1749 (Franklin Papers)
Copy: American Academy of Arts and Sciences
6William Watson: Notice of Franklin’s Experiments, 11 January 1750 (Franklin Papers)
: The Royal Society; also copy: American Academy of Arts and Sciences
7From Benjamin Franklin to Peter Collinson, 27 July 1750 (Franklin Papers)
Copy: American Academy of Arts and Sciences
8From Benjamin Franklin to Peter Collinson, 29 July 1750 (Franklin Papers)
Copy: American Academy of Arts and Sciences
9Opinions and Conjectures, [29 July 1750] (Franklin Papers)
Copy: American Academy of Arts and Sciences
10Additional Experiment, [27 September 1750] (Franklin Papers)
Copy: American Academy of Arts and Sciences