1To Benjamin Franklin from John Mitchell, [March 1745?] (Franklin Papers)
MS not found; reprinted from The American Medical and Philosophical Register; or Annals of...
2To Benjamin Franklin from John Mitchell, 12 September 1745 (Franklin Papers)
ALS : New-York Historical Society I was surprised to see yours of Jun. 15th. come to my hands...
3From Benjamin Franklin to John Mitchell, 29 April 1749 (Franklin Papers)
Copy: American Academy of Arts and Sciences Observations and Suppositions towards forming a new...