1Caspar Wistar to Thomas Jefferson, 9 October 1815 (Jefferson Papers)
language; Indian (American) [index entry]
2Thomas Jefferson to Peter Wilson, 20 January 1816 (Jefferson Papers)
language; Indian (American) [index entry]
3Thomas Jefferson to William Clark, 8 September 1816 (Jefferson Papers)
language; Indian (American) [index entry]
4William Clark to Thomas Jefferson, 10 October 1816 (Jefferson Papers)
language; Indian (American) [index entry]
5Peter S. Du Ponceau to Thomas Jefferson, 17 February 1817 (Jefferson Papers)
language; Indian (American) [index entry]
6John Vaughan to Thomas Jefferson, 18 June 1817 (Jefferson Papers)
language; Indian (American) [index entry]
7Thomas Jefferson to Peter S. Du Ponceau, 7 November 1817 (Jefferson Papers)
language; Indian (American) [index entry]
8Peter S. Du Ponceau to Thomas Jefferson, 5 December 1817 (Jefferson Papers)
language; Indian (American) [index entry]
9Peter S. Du Ponceau to Thomas Jefferson, 11 December 1817 (Jefferson Papers)
language; Indian (American) [index entry]
10Thomas Jefferson to Peter S. Du Ponceau, 30 December 1817 (Jefferson Papers)
language; Indian (American) [index entry]
11Peter S. Du Ponceau to Thomas Jefferson, 6 January 1818 (Jefferson Papers)
language; Indian (American) [index entry]
12Peter S. Du Ponceau to Thomas Jefferson, 22 January 1818 (Jefferson Papers)
language; Indian (American) [index entry]
13Enclosure: Nicholas Biddle to William Tilghman, 6 April 1818 (Jefferson Papers)
language; Indian (American) [index entry]
14Peter S. Du Ponceau to Thomas Jefferson, 14 April 1818 (Jefferson Papers)
language; Indian (American) [index entry]
15Enclosure: Prospectus for Transactions of the Historical and Literary Committee of the American Philosophical Society … (Jefferson Papers)
language; Indian (American) [index entry]
16Thomas Jefferson to Peter S. Du Ponceau, 14 March [1819] (Jefferson Papers)
language; Indian (American) [index entry]
17Enclosure: Edy Turner’s Vocabulary of the Nottoway Language, 4 March 1820 (Jefferson Papers)
language; Indian (American) [index entry]
18Thomas Jefferson to Peter S. Du Ponceau, 7 July 1820 (Jefferson Papers)
language; Indian (American) [index entry]
19Peter S. Du Ponceau to Thomas Jefferson, 12 July 1820 (Jefferson Papers)
language; Indian (American) [index entry]
20Enclosure: Peter S. Du Ponceau’s Comparison of Indian Numerals, [ca. 12 July 1820] (Jefferson Papers)
language; Indian (American) [index entry]
21Peter S. Du Ponceau to Thomas Jefferson, 13 July 1820 (Jefferson Papers)
language; Indian (American) [index entry]
22Enclosure: Peter S. Du Ponceau’s Comparison of the Nottoway and Iroquois Languages, [ca. 13 July 1820] (Jefferson Papers)
language; Indian (American) [index entry]
23Peter S. Du Ponceau to Thomas Jefferson, 18 July 1820 (Jefferson Papers)
language; Indian (American) [index entry]
24Peter S. Du Ponceau to Thomas Jefferson, 12 September 1820 (Jefferson Papers)
language; Indian (American) [index entry]
25Peter S. Du Ponceau to Thomas Jefferson, 14 December 1820 (Jefferson Papers)
language; Indian (American) [index entry]
26John Pickering to Thomas Jefferson, 28 January 1822 (Jefferson Papers)
language; Indian (American) [index entry]
27Thomas Jefferson to John Pickering, 13 February 1822 (Jefferson Papers)
language; Indian (American) [index entry]
28Enclosure: 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]