1John Adams to Thomas Jefferson, 30 December 1818 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]
2John Adams to Thomas Jefferson, 29 January 1819 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]
3John Adams to Thomas Jefferson, 24 February 1819 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]
4John Adams to Thomas Jefferson, 2 March 1819 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]
5John Adams to Thomas Jefferson, 2 April 1819 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]