1Peter S. Du Ponceau to Thomas Jefferson, 14 November 1815 (Jefferson Papers)
American Philosophical Society; collections of [index entry]
2Peter S. Du Ponceau to Thomas Jefferson, 8 February 1816 (Jefferson Papers)
American Philosophical Society; collections of [index entry]
3Thomas Jefferson to Peter S. Du Ponceau, 26 January 1817 (Jefferson Papers)
American Philosophical Society; collections of [index entry]
4Peter S. Du Ponceau to Thomas Jefferson, 17 February 1817 (Jefferson Papers)
American Philosophical Society; collections of [index entry]
5Thomas Jefferson to Wilson Cary Nicholas, 19 March 1817 (Jefferson Papers)
American Philosophical Society; collections of [index entry]
6Thomas Jefferson to Wilson Cary Nicholas, 10 June 1817 (Jefferson Papers)
American Philosophical Society; collections of [index entry]
7Thomas Jefferson to Benjamin Harrison, 26 June 1817 (Jefferson Papers)
American Philosophical Society; collections of [index entry]
8Thomas Jefferson to Peter S. Du Ponceau, 7 November 1817 (Jefferson Papers)
American Philosophical Society; collections of [index entry]
9Peter S. Du Ponceau to Thomas Jefferson, 5 December 1817 (Jefferson Papers)
American Philosophical Society; collections of [index entry]
10Peter S. Du Ponceau to Thomas Jefferson, 6 January 1818 (Jefferson Papers)
American Philosophical Society; collections of [index entry]