111Joseph Milligan to Thomas Jefferson, 27 November 1820 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]
112Thomas Jefferson to Destutt de Tracy, 26 December 1820 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]
113Destutt de Tracy to Thomas Jefferson, 22 February 1821 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]