1Joseph C. Cabell to Thomas Jefferson, 4 July 1816 (Jefferson Papers)
Catechism of Political Economy (J. B. Say; trans. J. Richter) [index entry]
2Thomas Jefferson to Joseph C. Cabell, 13 July 1816 (Jefferson Papers)
Catechism of Political Economy (J. B. Say; trans. J. Richter) [index entry]