1To Benjamin Franklin from George Croghan, 2 October 1767 (Franklin Papers)
LS : William L. Clements Library; LS : American Philosophical Society; draft: Historical Society...
2List of Fossils Sent by George Croghan to the Earl of Shelburne and Benjamin Franklin, 7 February 1767 (Franklin Papers)
Printed in The Royal Society, Philosophical Transactions , LVII. Part i. For the Year 1767...
3To Benjamin Franklin from George Croghan, 27 January 1767 (Franklin Papers)
LS : William L. Clements Library; extract: Public Record Office By the last packet from hence, I...