1From Benjamin Franklin to Joseph Priestley, 4 May 1772 (Franklin Papers)
ALS (draft): American Philosophical Society I think with you that there cannot be the least...
2From Benjamin Franklin to Joseph Priestley, [July 1772]: extract (Franklin Papers)
Extract: printed in Joseph Priestley, “Observations on Different Kinds of Air,” the Royal...
3From Benjamin Franklin to Joseph Priestley, 19 September 1772 (Franklin Papers)
ALS (letterbook draft) and copy: Library of Congress In July, 1772, Lord Shelburne asked...