1Horatio G. Spafford to Thomas Jefferson, 28 February 1822 (Jefferson Papers)
Williams, Samuel (1743–1817); The Natural and Civil History of Vermont [index entry]
2Horatio G. Spafford to Thomas Jefferson, 6 April 1815 (Jefferson Papers)
Williams, Samuel (1743–1817); The Natural and Civil History of Vermont [index entry]
3Thomas Jefferson to Horatio G. Spafford, 15 March 1815 (Jefferson Papers)
Williams, Samuel (1743–1817); The Natural and Civil History of Vermont [index entry]
4Horatio G. Spafford to Thomas Jefferson, 24 February 1815 (Jefferson Papers)
Williams, Samuel (1743–1817); The Natural and Civil History of Vermont [index entry]
5Thomas Jefferson to Nathaniel Chapman, 11 December 1809 (Jefferson Papers)
Williams, Samuel (1743–1817); The Natural and Civil History of Vermont [index entry]
6Enclosure: Thomas Jefferson’s List of Recommended Books, [ca. 4 October 1809] (Jefferson Papers)
Williams, Samuel (1743–1817); The Natural and Civil History of Vermont [index entry]