1William Thornton to Thomas Jefferson, 20 January 1812 (Jefferson Papers)
patents; of O. Barrett [index entry]
2Thomas Jefferson to Oliver Barrett, 20 February 1812 (Jefferson Papers)
patents; of O. Barrett [index entry]
3Oliver Barrett to Thomas Jefferson, 10 April 1812 (Jefferson Papers)
patents; of O. Barrett [index entry]
4Thomas Jefferson to William Thornton, 24 April 1812 (Jefferson Papers)
patents; of O. Barrett [index entry]
5William Thornton to Thomas Jefferson, 27 June 1812 (Jefferson Papers)
patents; of O. Barrett [index entry]