Columbia subject headings:
Hours of labor--Law and legislation--United States--History.
Overtime--United States.
United States. Fair Labor Standards Act of 1938.
White collar workers--United States--History.
Harvard subject headings:
Hours of labor--Law and legislation--United States--History.
Overtime--Law and legislation--United States--History.
Overtime--United States.
United States. Fair Labor Standards Act of 1938.
White collar workers--Legal status, laws, etc.--United States--History.
White collar workers--United States--History.
Princeton subject headings:
Hours of labor--Law and legislation--United States--History.
Overtime--United States.
United States. Fair Labor Standards Act of 1938
White collar workers--United States--History.