1Thomas Jefferson to Isaac Riley, 7 October 1809 (Jefferson Papers)
Notes on the State of Virginia (Thomas Jefferson); Paris edition [index entry]
2Isaac Riley to Thomas Jefferson, 16 October 1809 (Jefferson Papers)
Notes on the State of Virginia (Thomas Jefferson); Paris edition [index entry]
3Thomas Jefferson to Alexander von Humboldt, 14 April 1811 (Jefferson Papers)
Notes on the State of Virginia (Thomas Jefferson); Paris edition [index entry]
4Thomas Jefferson to Benjamin Austin, 9 January 1816 (Jefferson Papers)
Notes on the State of Virginia (Thomas Jefferson); Paris edition [index entry]
5Thomas Jefferson to Anthony Finley, 7 October 1818 (Jefferson Papers)
Notes on the State of Virginia (Thomas Jefferson); Paris edition [index entry]