1To George Washington from George Croghan, 18 August 1771 (Washington Papers)
I Should have Wrote you long ago in answer to yrs of 24th Nobr butt the Spring Turnd out Such...
2To Benjamin Franklin from George Croghan, 12 February 1768 (Franklin Papers)
Copy in Historical Society of Pennsylvania; fragment, lacking first five paragraphs, in American...
3To Benjamin Franklin from George Croghan, 2 October 1767 (Franklin Papers)
LS : William L. Clements Library; LS : American Philosophical Society; draft: Historical Society...
4List 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...
5To 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...
6To Benjamin Franklin from George Croghan, 12 December 1765 (Franklin Papers)
LS : Public Record Office As I am return’d to this City, after my long Tour thro’ the Indian...