This folder contains unsolicited correspondence and other documents relating to submarines. None of the few letters from 1916 received a substantive response. Most of Edison's correspondence concerning submarines can be found in the Naval Consulting Board and Wartime Research Papers, Special Collections Series. Correspondence and other documents pertaining to the explosion aboard the Navy's E-2 submarine in January 1916 can be found in E-16-22 (E-2 Explosion). Courtesy of Thomas Edison National Historical Park.