Columbia subject headings:
United States--Defenses.
Working class--United States.
World War, 1939-1945--United States.
Harvard subject headings:
Labor and laboring classes--United States.
United States--Defenses
Working class--United States
World War, 1939-1945--United States
Princeton subject headings:
Labor--United States.
United States--Defenses.
World War, 1939-1945--United States.