1Thomas Jefferson to Joseph Milligan, 1 December 1814 (Jefferson Papers)
The Nautical Almanac and Astronomical Ephemeris (J. Garnett); TJ orders [index entry]
2Thomas Jefferson to John Garnett, 4 January 1815 (Jefferson Papers)
The Nautical Almanac and Astronomical Ephemeris (J. Garnett); TJ orders [index entry]
3Thomas Jefferson: Book List, [after 6 October 1815] (Jefferson Papers)
The Nautical Almanac and Astronomical Ephemeris (J. Garnett); TJ orders [index entry]
4Thomas Jefferson to Joseph Milligan, 22 December 1815 (Jefferson Papers)
The Nautical Almanac and Astronomical Ephemeris (J. Garnett); TJ orders [index entry]