1Thomas A. Digges to Thomas Jefferson, 30 May 1818 (Jefferson Papers)
Campbell, George Washington; as minister plenipotentiary to Russia [index entry]
2Thomas Jefferson to Thomas A. Digges, 15 June 1818 (Jefferson Papers)
Campbell, George Washington; as minister plenipotentiary to Russia [index entry]
3Levett Harris to Thomas Jefferson, 2 July 1818 (Jefferson Papers)
Campbell, George Washington; as minister plenipotentiary to Russia [index entry]
4James Sloan to Thomas Jefferson, 4 July 1818 (Jefferson Papers)
Campbell, George Washington; as minister plenipotentiary to Russia [index entry]