1John Adlum to Thomas Jefferson, 15 February 1810 (Jefferson Papers)
American Philosophical Society; Transactions [index entry]
2To Thomas Jefferson from William Barton, 31 December 1791 (Jefferson Papers)
...Society on 2 Dec. 1791, were printed in the American Philosophical Society Transactions,
3Peter S. Du Ponceau to Thomas Jefferson, 5 January 1818 (Jefferson Papers)
American Philosophical Society; Transactions [index entry]
4Peter S. Du Ponceau to Thomas Jefferson, 14 February 1818 (Jefferson Papers)
American Philosophical Society; Transactions [index entry]
5Peter S. Du Ponceau to Thomas Jefferson, 22 January 1818 (Jefferson Papers)
American Philosophical Society; Transactions [index entry]
6Thomas Jefferson to Silvain Godon, 21 May 1810 (Jefferson Papers)
American Philosophical Society; Transactions [index entry]
7Thomas Jefferson to Peter S. Du Ponceau, 7 November 1817 (Jefferson Papers)
American Philosophical Society; Transactions [index entry]
8Thomas Jefferson to George Hargraves, 29 August 1814 (Jefferson Papers)
American Philosophical Society; Transactions [index entry]
9Thomas Jefferson to John Vaughan, 28 June 1817 (Jefferson Papers)
American Philosophical Society; Transactions [index entry]
10Thomas Jefferson to Caspar Wistar, 10 June 1817 (Jefferson Papers)
American Philosophical Society; Transactions [index entry]