1Thomas Jefferson to Albert Gallatin, 4 November 1809 (Jefferson Papers)
Simson, Robert; The Elements of Euclid [index entry]
2Thomas Jefferson to Louis H. Girardin, 18 March 1814 (Jefferson Papers)
Simson, Robert; The Elements of Euclid [index entry]
3Thomas Jefferson to Joseph Milligan, 9 December 1818 (Jefferson Papers)
Simson, Robert; The Elements of Euclid [index entry]
4Enclosure: Thomas Jefferson’s Supplemental List of Recommended Books, [ca. 4 October 1809] (Jefferson Papers)
Simson, Robert; The Elements of Euclid [index entry]