1Thomas Jefferson to Peter S. Du Ponceau, 17 January 1818 (Jefferson Papers)
American Philosophical Society; and B. de La Harpe manuscript [index entry]
2Peter S. Du Ponceau to Thomas Jefferson, 6 January 1818 (Jefferson Papers)
American Philosophical Society; and B. de La Harpe manuscript [index entry]
3Thomas Jefferson to John Quincy Adams, 1 November 1817 (Jefferson Papers)
American Philosophical Society; and B. de La Harpe manuscript [index entry]
4Thomas Jefferson to James Monroe, 9 April 1816 (Jefferson Papers)
American Philosophical Society; and B. de La Harpe manuscript [index entry]
5Thomas Jefferson to James Monroe, 4 February 1816 (Jefferson Papers)
American Philosophical Society; and B. de La Harpe manuscript [index entry]