11Thomas Jefferson to Oliver Evans, 16 January 1814 (Jefferson Papers)
patents; of O. Evans [index entry]
12Thomas Jefferson to John Staples, 25 January 1814 (Jefferson Papers)
patents; of O. Evans [index entry]
13Oliver Evans to Thomas Jefferson, 29 January 1814 (Jefferson Papers)
patents; of O. Evans [index entry]
14Thomas Cooper to Thomas Jefferson, 31 May 1814 (Jefferson Papers)
patents; of O. Evans [index entry]
15Thomas Jefferson to Charles Willson Peale, 13 June 1815 (Jefferson Papers)
patents; of O. Evans [index entry]
16John Wharton (1771–1845) to Thomas Jefferson, 8 July 1818 (Jefferson Papers)
patents; of O. Evans [index entry]
17Thomas Jefferson to John Wharton (1771–1845), 10 July 1818 (Jefferson Papers)
patents; of O. Evans [index entry]