21John Adams to Thomas Jefferson, 2 March 1819 (Jefferson Papers)
political economy; works on [index entry]
22Joseph Milligan to Thomas Jefferson, 3 March 1819 (Jefferson Papers)
political economy; works on [index entry]
23Destutt de Tracy to Thomas Jefferson, 10 March 1819 (Jefferson Papers)
political economy; works on [index entry]
24John Adams to Thomas Jefferson, 2 April 1819 (Jefferson Papers)
political economy; works on [index entry]
25Destutt de Tracy to Thomas Jefferson, 24 November 1820 (Jefferson Papers)
political economy; works on [index entry]
26Joseph Milligan to Thomas Jefferson, 27 November 1820 (Jefferson Papers)
political economy; works on [index entry]