Robert Charles Winthrop (1876). “Oration on the Centennial Anniversary of the Declaration of Independence: Delivered in the Music Hall, at the Request of the City Government, Boston, 4 July, 1876”, p.22
To Colonel Elias Dayton, 26 July 1777; cited in Helgerson, CIA Briefings (1996). When President Kennedy visited CIA in January 1961 he saw this letter on display and asked for a copy of it. He later wrote to DCI Allen Dulles, "The letter is both a fine memento of my visit with you and a continuing reminder of the role of intelligence in national policy."