Columbia subject headings:
Government publications--United States--Bibliography--Periodicals.
United States. Department of Labor--Bibliography--Periodicals.
Working class--Bibliography--Periodicals.
Harvard subject headings:
Princeton subject headings:
Government publications--United States--Bibliography--Periodicals.
Labor--United States--Bibliography--Periodicals.
Periodicals.
United States. Department of Labor--Bibliography--Periodicals.
Working class--United States--Bibliography--Periodicals.