Columbia subject headings:
Labor--United States--Longitudinal studies--Bibliography--Periodicals.
Labor--United States--Longitudinal studies--Periodicals.
National Longitudinal Surveys of Labor Market Experience (U.S.)--Periodicals.
Working class--United States--Longitudinal studies--Bibliography--Periodicals.
Working class--United States--Longitudinal studies--Periodicals.
Harvard subject headings:
Princeton subject headings:
Working class--United States--Bibliography--Periodicals.
Working class--United States--Longitudinal studies--Periodicals.
Working class--United States--Research--Periodicals.