1William Lambert to Thomas Jefferson, 4 September 1809 (Jefferson Papers)
Mackay, Andrew; The theory and practice of finding the Longitude at Sea or Land [index entry]
2Thomas Jefferson: Book List, [after 6 October 1815] (Jefferson Papers)
Mackay, Andrew; The theory and practice of finding the Longitude at Sea or Land [index entry]
3Thomas Jefferson to Nicolas G. Dufief, 17 May 1816 (Jefferson Papers)
Mackay, Andrew; The theory and practice of finding the Longitude at Sea or Land [index entry]
4Nicolas G. Dufief to Thomas Jefferson, 27 May 1816 (Jefferson Papers)
Mackay, Andrew; The theory and practice of finding the Longitude at Sea or Land [index entry]
5Thomas Jefferson to Nicolas G. Dufief, 9 June 1816 (Jefferson Papers)
Mackay, Andrew; The theory and practice of finding the Longitude at Sea or Land [index entry]