11To Benjamin Franklin from John MacMahon, 13 February 1783 (Franklin Papers)
AL : American Philosophical Society Doctor Mac Mahon presents his sincere respects to Dr....
12To Benjamin Franklin from John MacMahon, 25 March 1783 (Franklin Papers)
ALS : American Philosophical Society The Lady who intends to wait upon you with this letter is...
13To Benjamin Franklin from John MacMahon, 11 February 1784 (Franklin Papers)
AL : American Philosophical Society Doctor MacMahon presents his best respects to the Honourable...