21Thomas Jefferson to John Vaughan, 1 March 1815 (Jefferson Papers)
mathematics; books on [index entry]
22Thomas Jefferson to Louis H. Girardin, 4 March 1815 (Jefferson Papers)
mathematics; books on [index entry]
23Thomas Jefferson to Louis H. Girardin, 12 May 1815 (Jefferson Papers)
mathematics; books on [index entry]
24Nicolas G. Dufief to Thomas Jefferson, 5 August 1815 (Jefferson Papers)
mathematics; books on [index entry]
25Thomas Jefferson to Joseph Milligan, 11 August 1815 (Jefferson Papers)
mathematics; books on [index entry]
26Thomas Jefferson to Nicolas G. Dufief, 16 August 1815 (Jefferson Papers)
mathematics; books on [index entry]
27Thomas Jefferson to Joseph Milligan, 17 August 1815 (Jefferson Papers)
mathematics; books on [index entry]
28Nicolas G. Dufief to Thomas Jefferson, 25 August 1815 (Jefferson Papers)
mathematics; books on [index entry]
29Enclosure: Thomas Jefferson’s Account with Nicolas G. Dufief, [ca. 25 August 1815] (Jefferson Papers)
mathematics; books on [index entry]
30Thomas Jefferson to Joseph Milligan, 5 October 1815 (Jefferson Papers)
mathematics; books on [index entry]