1Thomas Jefferson to Wilson Cary Nicholas, 19 April 1816 (Jefferson Papers)
Walker, Thomas (1715–94); as surveyor [index entry]
2Thomas Jefferson to Archibald Stuart, 15 March 1819 (Jefferson Papers)
Walker, Thomas (1715–94); as surveyor [index entry]
3Jesse Wharton to Thomas Jefferson, 30 May 1820 (Jefferson Papers)
Walker, Thomas (1715–94); as surveyor [index entry]
4Thomas Jefferson to Jesse Wharton, 22 June 1820 (Jefferson Papers)
Walker, Thomas (1715–94); as surveyor [index entry]