1William Roscoe to Thomas Jefferson, 25 April 1809 (Jefferson Papers)
Life and Pontificate of Leo the Tenth (W. Roscoe) [index entry]
2Thomas Jefferson to Meriwether Lewis, 16 August 1809 (Jefferson Papers)
Life and Pontificate of Leo the Tenth (W. Roscoe) [index entry]
3Thomas Cooper to Thomas Jefferson, 15 September 1814 (Jefferson Papers)
Life and Pontificate of Leo the Tenth (W. Roscoe) [index entry]
4William Roscoe to Thomas Jefferson, 28 February 1819 (Jefferson Papers)
Life and Pontificate of Leo the Tenth (W. Roscoe) [index entry]