1Thomas Cooper to Thomas Jefferson, 10 May 1810 (Jefferson Papers)
2James Madison to Thomas Jefferson, 22 June 1810 (Jefferson Papers)
3Thomas Jefferson to Joseph C. Cabell, 27 June 1810 (Jefferson Papers)
4Thomas Jefferson to James Madison , 27 June 1810 (Jefferson Papers)
5Thomas Jefferson to Thomas Cooper, 6 August 1810 (Jefferson Papers)