1Marc Antoine Jullien to Thomas Jefferson, 30 November 1817 (Jefferson Papers)
2Victor du Pont and Eleuthère I. du Pont de Nemours to Thomas Jefferson, 11 August 1817 (Jefferson Papers)
3Thomas Jefferson to Marc Antoine Jullien, 23 July 1818 (Jefferson Papers)
4Thomas Jefferson to Eleuthere I. du Pont de Nemours, 9 September 1817 (Jefferson Papers)