21Thomas Jefferson to Joseph Milligan, 9 December 1818 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; A Treatise on Political Economy [index entry]
22Thomas Jefferson to Joseph Milligan, 9 April 1819 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; A Treatise on Political Economy [index entry]
23Thomas Jefferson to Joseph Milligan, 13 April 1819 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; A Treatise on Political Economy [index entry]