1Tristram Dalton to Thomas Jefferson, 21 August 1815 (Jefferson Papers)
agriculture; “Essays on the Natural History and Origin of Peat” (R. Rennie) [index entry]
2Thomas Jefferson to Tristram Dalton, 13 October 1815 (Jefferson Papers)
agriculture; “Essays on the Natural History and Origin of Peat” (R. Rennie) [index entry]