1Thomas Jefferson to William Caruthers, 15 March 1815 (Jefferson Papers)
Jefferson, Thomas; Opinions on; Natural Bridge [index entry]
2Thomas Jefferson to William Steptoe, 13 September 1815 (Jefferson Papers)
Jefferson, Thomas; Opinions on; Natural Bridge [index entry]
3Maximilian Godefroy to Thomas Jefferson, 12 October 1816 (Jefferson Papers)
Jefferson, Thomas; Opinions on; Natural Bridge [index entry]
4Thomas Jefferson to Maximilian Godefroy, 11 November 1816 (Jefferson Papers)
Jefferson, Thomas; Opinions on; Natural Bridge [index entry]