1Thomas Jefferson to Joseph Milligan, 17 August 1815 (Jefferson Papers)
Hutton, Charles; Mathematical Tables [index entry]
2Thomas Jefferson to Joseph Milligan, 5 October 1815 (Jefferson Papers)
Hutton, Charles; Mathematical Tables [index entry]
3Thomas Jefferson to Joseph Milligan, 27 October 1815 (Jefferson Papers)
Hutton, Charles; Mathematical Tables [index entry]
4Thomas Jefferson to Joseph Milligan, 22 December 1815 (Jefferson Papers)
Hutton, Charles; Mathematical Tables [index entry]