Columbia subject headings:
Mexico--Boundaries--United States.
Mexico--Economic conditions.
United States--Boundaries--Mexico.
Harvard subject headings:
Labor supply--Mexican-American Border Region.
Labor supply--Mexico, North.
Labor supply--Mexico.
Mexican-American Border Region--Economic conditions.
Mexico, North--Economic conditions.
Mexico--Economic conditions--1970-1982.
Princeton subject headings:
Mexico--Boundaries--United States.
Mexico--Economic conditions.
United States--Boundaries--Mexico.