1Robert Patterson to Thomas Jefferson, 2 December 1815 (Jefferson Papers)
Patterson, Robert; and F. R. Hassler’s claim [index entry]
2Thomas Jefferson to James Madison, 22 December 1815 (Jefferson Papers)
Patterson, Robert; and F. R. Hassler’s claim [index entry]
3Thomas Jefferson to Robert Patterson, 22 December 1815 (Jefferson Papers)
Patterson, Robert; and F. R. Hassler’s claim [index entry]
4Ferdinand R. Hassler to Thomas Jefferson, 10 December 1819 (Jefferson Papers)
Patterson, Robert; and F. R. Hassler’s claim [index entry]
5Thomas Jefferson to Ferdinand R. Hassler, 25 December 1819 (Jefferson Papers)
Patterson, Robert; and F. R. Hassler’s claim [index entry]