1To 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...
2To 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...
3List 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...
4From Benjamin Franklin to George Croghan, 14 April 1767 (Franklin Papers)
ALS : Historical Society of Pennsylvania I received your Favour of Jany. 16. with the Copy of...
5From Benjamin Franklin to George Croghan, 5 August 1767 (Franklin Papers)
MS not found; reprinted from William Temple Franklin, ed., Memoirs of the Life and Writings of...
6To Benjamin Franklin from George Croghan, 2 October 1767 (Franklin Papers)
LS : William L. Clements Library; LS : American Philosophical Society; draft: Historical Society...
7To Benjamin Franklin from George Croghan, 12 February 1768 (Franklin Papers)
Copy in Historical Society of Pennsylvania; fragment, lacking first five paragraphs, in American...