Columbia subject headings:
Harvard subject headings:
Apprentices--United States--Statistics--Periodicals.
Discrimination in employment--United States--Statistics--Periodicals.
Minority labor union members--United States--Statistics--Periodicals.
Women labor union members--United States--Statistics--Periodicals.
Princeton subject headings:
Apprentices--United States--Statistics--Periodicals.
Discrimination in employment--United States--Statistics--Periodicals.
Minority labor union members--Minority membership--United States--Statistics--Periodicals.
Periodicals.
Statistics.
Women labor union members--United States--Statistics--Periodicals.