found: NUCMC data from Va. Poly. Inst. and St. Univ. Libr. for Claytor, R.B. Papers, 1952-1978(W. Graham Claytor; brother of Robert B. Claytor)
found: WWA, 1982-1983(Claytor, William Graham, Jr.; lawyer; r.r. exec.; govt. ofcl.; b. Roanoke, Va., Mar. 14, 1912; home: Washington, D.C.)
found: LC data base, 5-19-92(hdg.: Claytor, W. Graham, 1912- )
found: Trains magazine, Aug. 1994:p. 20-22 (W. Graham Claytor; b. March 14, 1912; d. May 14, 1994 at Bradenton, Fla.)
found: Who was who in American, Vol. XI:p. 54 (Claytor, William Graham, Jr.; born March 14, 1912 at Roanoke, Va.; died May 14, 1994; lawyer, railroad executive and cabinet officer; with Covington & Burling, Washington, D.C., 1938-1982; with Southern Railway Company, 1963-1977; president and CEO, 1967-1977; chair and CEO, 1976-1977; secretary of the navy, 1977-1979; deputy secretary of defense, 1979-1981; chair, National Railroad Passenger Corporation [Amtrak], 1982-1994)
found: e-mail correspondence with W. Graham Claytor VI, 4 October 2015(goes informally by Graham; full legal name is William Graham Claytor IV; requests roman numeral to be part of the form; born 1983. Information about his predecessors: William Graham Claytor I: 1821-1903; William Graham Claytor II: 1852-1903, politician from Virginia and author of the novel Pleasant waters (1888) and others; William Graham Claytor III: 1886-1971; William Graham Claytor IV: 1912-1994, often went by "Jr." rather than "IV"; William Graham Claytor V: 1951- , went by "III". The earliest William Graham Claytors didn't use roman numerals to distinguish between themselves)
found: FamilySearch, 4 October 2015(William Graham Claytor, Jr.; William Graham Claytor IV; born 14 March 1912, Roanoke, Virginia; died 14 May 1994, Brandenton, Florida)