1Enclosure: Peter S. Du Ponceau’s Comparison of Indian Numerals, [ca. 12 July 1820] (Jefferson Papers)
language; Indian (American) [index entry]
2Enclosure: Peter S. Du Ponceau’s Comparison of the Nottoway and Iroquois Languages, [ca. 13 July 1820] (Jefferson Papers)
language; Indian (American) [index entry]
3Enclosure: Edy Turner’s Vocabulary of the Nottoway Language, 4 March 1820 (Jefferson Papers)
language; Indian (American) [index entry]
4Enclosure: Oliver Everett’s Advertisement for the Memoirs of the American Academy of Arts and Sciences, [ca. 22 April … (Jefferson Papers)
language; Indian (American) [index entry]
5Enclosure: Prospectus for Transactions of the Historical and Literary Committee of the American Philosophical Society … (Jefferson Papers)
language; Indian (American) [index entry]
6Thomas Jefferson to Peter S. Du Ponceau, 7 July 1820 (Jefferson Papers)
language; Indian (American) [index entry]
7Thomas Jefferson to John Pickering, 13 February 1822 (Jefferson Papers)
language; Indian (American) [index entry]
8Thomas Jefferson to Peter S. Du Ponceau, 14 March [1819] (Jefferson Papers)
language; Indian (American) [index entry]
9Peter S. Du Ponceau to Thomas Jefferson, 14 April 1818 (Jefferson Papers)
language; Indian (American) [index entry]
10Peter S. Du Ponceau to Thomas Jefferson, 14 December 1820 (Jefferson Papers)
language; Indian (American) [index entry]