1Thomas Jefferson to Mathew Carey, 19 June 1813 (Jefferson Papers)
submarines; invented by D. Bushnell [index entry]
2Thomas Jefferson to Robert Fulton, 21 July 1813 (Jefferson Papers)
submarines; invented by D. Bushnell [index entry]
3Thomas Jefferson to George Hargraves, 29 August 1814 (Jefferson Papers)
submarines; invented by D. Bushnell [index entry]
4Thomas Jefferson to Wilson Cary Nicholas, 2 April 1816 (Jefferson Papers)
submarines; invented by D. Bushnell [index entry]