Columbia subject headings:
Foreign workers, Mexican--United States--History.
Mexican Americans--Employment--History.
Minority labor union members--United States--History.
Harvard subject headings:
Foreign workers, Mexican--United States--History.
Mexican Americans--Employment--History.
Minority labor union members--United States--History.
Princeton subject headings:
Foreign workers, Mexican--United States--History.
Labor unions--United States--Minority membership.
Mexican Americans--Employment--History.