1To Benjamin Franklin from Nevil Maskelyne, 27 December 1769 (Franklin Papers)
ALS : American Philosophical Society I think I desired the favor of you lately by letter, that...
2To Benjamin Franklin from Nevil Maskelyne, 11 December 1769: résumé (Franklin Papers)
ALS : American Philosophical Society [Greenwich, December 11, 1769. The Astronomer Royal asks...