1To Benjamin Franklin from Emanuel Mendes da Costa, 20 July 1765 (Franklin Papers)
ALS : Historical Society of Pennsylvania The Committee for Mr. Canton’s Experiments meet Again on...
2To Benjamin Franklin from Emanuel Mendes da Costa, 25 August 1765 (Franklin Papers)
ALS : Historical Society of Pennsylvania The Committee for examining Mr. Canton’s Experiments On...
3To Benjamin Franklin from Emanuel Mendes da Costa, 2 February 1767 (Franklin Papers)
Printed form with MS insertions in blanks: American Philosophical Society The Committee (to whom...