1Thomas Jefferson to John Adams, 8 September 1817 (Jefferson Papers)
The Philosophy of Human Nature (J. Buchanan) [index entry]
2John Adams to Thomas Jefferson, 26 May 1817 (Jefferson Papers)
The Philosophy of Human Nature (J. Buchanan) [index entry]
3John Adams to Thomas Jefferson, 18 May 1817 (Jefferson Papers)
The Philosophy of Human Nature (J. Buchanan) [index entry]