1Caspar Wistar to Thomas Jefferson, 9 October 1815 (Jefferson Papers)
Heckewelder, John; and Indians [index entry]
2Thomas Jefferson to Caspar Wistar, 22 October 1815 (Jefferson Papers)
Heckewelder, John; and Indians [index entry]
3Peter S. Du Ponceau to Thomas Jefferson, 22 January 1818 (Jefferson Papers)
Heckewelder, John; and Indians [index entry]
4Enclosure: Prospectus for Transactions of the Historical and Literary Committee of the American Philosophical Society … (Jefferson Papers)
Heckewelder, John; and Indians [index entry]
5Thomas Jefferson to Peter S. Du Ponceau, 14 March [1819] (Jefferson Papers)
Heckewelder, John; and Indians [index entry]
6Enclosure: Edy Turner’s Vocabulary of the Nottoway Language, 4 March 1820 (Jefferson Papers)
Heckewelder, John; and Indians [index entry]
7Peter S. Du Ponceau to Thomas Jefferson, 18 July 1820 (Jefferson Papers)
Heckewelder, John; and Indians [index entry]
8Constantine S. Rafinesque to Thomas Jefferson, 1 August 1820 (Jefferson Papers)
Heckewelder, John; and Indians [index entry]
9Constantine S. Rafinesque to Thomas Jefferson, 10 August 1820 (Jefferson Papers)
Heckewelder, John; and Indians [index entry]