found: NUCMC data from Temple Univ. Libr. for Americans for Dem. Action. Southeastern Chapter. Records, 1947-67 (Robert N. C. Nix)
found: New York Times, 6/24/87 (Robert N.C. Nix, Sr., Pennsylvania's first Black Congressman, d. 6/22/87; U.S. Rep. from Philadelphia, served on House Post Office and Civil Service Committee and Foreign Affairs Committee; survived by his son; Robert N.C. Nix, Jr., chief justice of Pa.)
found: Biog. dir. of the U.S. Congress, 1774-1961 (Nix, Robert Nelson Cornelius, 1905-, from Philadelphia)
found: LC data base, 12/7/87 (hdg.: Nix, Robert N.C.)
found: Black Americans in Congress, 1870-2007, 2008, viewed online Aug. 18, 2009: p. 318 (Robert Nelson Cornelius Nix, Sr., 1898-1987; b. Aug. 9, 1898, in Orangeburg, S.C.) p. 322, note 2 ("Ex-Rep. Nix, 'Pathfinder,' Dead at 88," 23 June 1987, Philadelphia Daily: 4)
found: Biog. dir. of the U.S. Cong. online, viewed Aug. 18, 2009 (Nix, Robert Nelson Cornelius, Sr., a Representative from Penn.; b. Aug. 9, 1898; d. June 22, 1987)