1Nicolas G. Dufief to Thomas Jefferson, 25 August 1815 (Jefferson Papers)
astronomy; books on [index entry]
2Enclosure: Thomas Jefferson’s Account with Nicolas G. Dufief, [ca. 25 August 1815] (Jefferson Papers)
astronomy; books on [index entry]
3Nicolas G. Dufief to Thomas Jefferson, 7 January 1817 (Jefferson Papers)
astronomy; books on [index entry]
4Enclosure: Thomas Jefferson’s Account with Nicolas G. Dufief (Jefferson Papers)
astronomy; books on [index entry]