1Thomas Cooper to Thomas Jefferson, 25 July 1812 (Jefferson Papers)
Watson, Richard, bishop of Llandaff [index entry]
2Thomas Cooper to Thomas Jefferson, 15 September 1814 (Jefferson Papers)
Watson, Richard, bishop of Llandaff [index entry]
3Thomas Jefferson to Francis Adrian Van der Kemp, 9 February 1818 (Jefferson Papers)
Watson, Richard, bishop of Llandaff; Chemical Essays [index entry]
4Timothy Pickering to Thomas Jefferson, 12 February 1821 (Jefferson Papers)
Watson, Richard, bishop of Llandaff; An Apology for Christianity, in a Series of Letters...