11George Ticknor’s Account of a Visit to Monticello, [4–7 February 1815] (Jefferson Papers)
12Enclosure: Destutt de Tracy to Pierre Samuel Du Pont de Nemours, 30 January 1816 (Jefferson Papers)
13Thomas Jefferson to Pierre Samuel Du Pont de Nemours, 3 August 1816 (Jefferson Papers)
14Pierre Samuel Du Pont de Nemours to Thomas Jefferson, 18 August 1816 (Jefferson Papers)