1Ambrose Maréchal to Thomas Jefferson, 28 January 1818 (Jefferson Papers)
Maréchal, Ambrose; and A. Dugnani [index entry]
2Thomas Jefferson to Antonio Dugnani, 14 February 1818 (Jefferson Papers)
Maréchal, Ambrose; and A. Dugnani [index entry]
3Thomas Jefferson to Ambrose Maréchal, 15 February 1818 (Jefferson Papers)
Maréchal, Ambrose; and A. Dugnani [index entry]