1Joseph Milligan to Thomas Jefferson, 6 February 1818 (Jefferson Papers)
Ewell, Thomas; and D. Hume’sPhilosophical Essays [index entry]
2Thomas Jefferson to Thomas Ewell, 18 February 1818 (Jefferson Papers)
Ewell, Thomas; and D. Hume’sPhilosophical Essays [index entry]
3Thomas Jefferson to Joseph Milligan, 18 February 1818 (Jefferson Papers)
Ewell, Thomas; and D. Hume’sPhilosophical Essays [index entry]