"United States" . . . . . . . . . . . . . "Sources" . . . . . . . "NAACP and labor, 1956-1965" . . "History" . . . "Archives" . . "Papers of the NAACP. Supplement to Part 13, the NAACP and labor, 1956-1965" . . . . . . . . "1877 - 1999" . .