Columbia subject headings:
Hours of labor--Law and legislation--United States--Cases.
Hours of labor--Law and legislation--United States--Periodicals.
Labor laws and legislation--United States--Cases.
Wages--Law and legislation--United States--Cases.
Wages--Law and legislation--United States--Periodicals.
Harvard subject headings:
Hours of labor--Law and legislation--United States--Cases.
Hours of labor--Law and legislation--United States--Periodicals.
Wages--Law and legislation--United States--Cases.
Wages--Law and legislation--United States--Periodicals.
Princeton subject headings: