1Pierre Samuel Du Pont de Nemours to Thomas Jefferson, 12 June 1809 (Jefferson Papers)
Oeuvres (A. R. J. Turgot) [index entry]
2Pierre Samuel Du Pont de Nemours to Thomas Jefferson, 31 March 1811 (Jefferson Papers)
Oeuvres (A. R. J. Turgot) [index entry]
3Pierre Samuel Du Pont de Nemours to Thomas Jefferson, 4 July 1811 (Jefferson Papers)
Oeuvres (A. R. J. Turgot) [index entry]
4Pierre Samuel Du Pont de Nemours to Thomas Jefferson, 5 September 1811 (Jefferson Papers)
Oeuvres (A. R. J. Turgot) [index entry]