Columbia subject headings:
Unemployed--United States.
Unemployment--United States.
Working class--Statistics.
Working class--United States.
Harvard subject headings:
Labor--United States
Unemployed--United States
Unemployment--United States
Wages--United States.
Working class--Statistics
Working class--United States
World War, 1939-1945--Labor.
Princeton subject headings:
Labor supply--United States--Statistics--Periodicals.
Periodicals.
Statistics.
Wages--United States--Statistics--Periodicals.