1Enclosure: Resolution by the Historical and Literary Committee of the American Philosophical Society, 30 October 1815 (Jefferson Papers)
2Peter S. Du Ponceau to Thomas Jefferson, 14 November 1815 (Jefferson Papers)
3Thomas Jefferson to Peter S. Du Ponceau, 22 January 1816 (Jefferson Papers)
4Peter S. Du Ponceau to Thomas Jefferson, 8 February 1816 (Jefferson Papers)
5Thomas Jefferson to Peter S. Du Ponceau, 26 January 1817 (Jefferson Papers)
6Peter S. Du Ponceau to Thomas Jefferson, 17 February 1817 (Jefferson Papers)
7Thomas Jefferson to Peter S. Du Ponceau, 6 November 1817 (Jefferson Papers)
8Thomas Jefferson to Peter S. Du Ponceau, 7 November 1817 (Jefferson Papers)
9Peter S. Du Ponceau to Thomas Jefferson, 5 December 1817 (Jefferson Papers)
10Peter S. Du Ponceau to Thomas Jefferson, 11 December 1817 (Jefferson Papers)