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