Columbia subject headings:
Harvard subject headings:
Mexican-American Border Region--Economic conditions.
Mexican-American Border Region--History.
Mexican-American Border Region--Social conditions.
Mexico--Boundaries--United States.
Mexico--Emigration and immigration.
Mexico--Foreign economic relations--United States.
United States--Boundaries--Mexico.
United States--Emigration and immigration.
United States--Foreign economic relations--Mexico.
Princeton subject headings:
Mexican-American Border Region--Economic conditions.
Mexican-American Border Region--Social conditions.