1Thomas Jefferson to Nicolas G. Dufief, 27 October 1812 (Jefferson Papers)
Simpson, Thomas; The Doctrine and Application of Fluxions [index entry]
2Nicolas G. Dufief to Thomas Jefferson, 5 November 1812 (Jefferson Papers)
Simpson, Thomas; The Doctrine and Application of Fluxions [index entry]
3Thomas Jefferson to Nicolas G. Dufief, 25 December 1812 (Jefferson Papers)
Simpson, Thomas; The Doctrine and Application of Fluxions [index entry]
4Enclosure: Nicolas G. Dufief’s Account with Thomas Jefferson for Books, [ca. 31 May 1813] (Jefferson Papers)
Simpson, Thomas; The Doctrine and Application of Fluxions [index entry]
5Enclosure: Account with Nicolas G. Dufief, [6 April 1814] (Jefferson Papers)
Simpson, Thomas; The Doctrine and Application of Fluxions [index entry]
6Enclosure: Alden Partridge’s Observations on the Use of Barometers to Compute Altitudes, 20 August 1811 (Jefferson Papers)
Simpson, Thomas; The Doctrine and Application of Fluxions [index entry]