Columbia subject headings:
Labor unions--United States.
Working class--United States.
World War, 1939-1945--Manpower.
Harvard subject headings:
Labor unions--United States
Labor--United States
Working class--United States
World War, 1939-1945--Manpower.
Princeton subject headings:
Labor unions--United States.
Labor--United States.
World War, 1939-1945--Manpower.