1Thomas Jefferson to Isaac McPherson, 13 August 1813 (Jefferson Papers)
Evans, Oliver; originality of machinery questioned [index entry]
2Thomas Jefferson to Isaac McPherson, 18 September 1813 (Jefferson Papers)
Evans, Oliver; originality of machinery questioned [index entry]
3Thomas Jefferson to Oliver Evans, 16 January 1814 (Jefferson Papers)
Evans, Oliver; originality of machinery questioned [index entry]