1George Alexander Otis to Thomas Jefferson, 20 June 1820 (Jefferson Papers)
2Thomas Jefferson to Louis H. Girardin, 8 July 1820 (Jefferson Papers)
3Thomas Jefferson to George Alexander Otis, 8 July 1820 (Jefferson Papers)
4George Alexander Otis to Thomas Jefferson, 15 July 1820 (Jefferson Papers)
5Louis H. Girardin to Thomas Jefferson, 16 August 1820 (Jefferson Papers)
6George Alexander Otis to Thomas Jefferson, 5 December 1820 (Jefferson Papers)
7Thomas Jefferson to George Alexander Otis, 25 December 1820 (Jefferson Papers)
8Thomas Jefferson to David Bailie Warden, 26 December 1820 (Jefferson Papers)
9George Alexander Otis to Thomas Jefferson, 4 January 1821 (Jefferson Papers)
10Thomas Jefferson to John Vaughan, 6 January 1821 (Jefferson Papers)