1Robert Patterson to Thomas Jefferson, 12 March 1811 (Jefferson Papers)
Garnett, John; Nautical Almanac and Astronomical Ephemeris [index entry]
2Robert Patterson to Thomas Jefferson, 23 September 1811 (Jefferson Papers)
Garnett, John; Nautical Almanac and Astronomical Ephemeris [index entry]
3Robert Patterson to Thomas Jefferson, 11 November 1811 (Jefferson Papers)
Garnett, John; Nautical Almanac and Astronomical Ephemeris [index entry]