1Thomas Appleton to Thomas Jefferson, 25 February 1819 (Jefferson Papers)
Mexico; works on [index entry]
2Constantine S. Rafinesque to Thomas Jefferson, 10 August 1820 (Jefferson Papers)
Mexico; works on [index entry]
3William Davis Robinson to Thomas Jefferson, 28 December 1820 (Jefferson Papers)
Mexico; works on [index entry]
4Thomas Jefferson to William Davis Robinson, 29 January 1821 (Jefferson Papers)
Mexico; works on [index entry]