Columbia subject headings:
Mexican-American Border Region--Commerce--Congresses.
Mexican-American Border Region--Economic conditions--Congresses.
Mexican-American Border Region--Population--Congresses.
Mexican-American Border Region--Social conditions--Congresses.
Mexico--Foreign economic relations--United States--Congresses.
United States--Foreign economic relations--Mexico--Congresses.
Harvard subject headings:
Mexican-American Border Region--Commerce--Congresses.
Mexican-American Border Region--Economic conditions--Congresses.
Mexican-American Border Region--Population--Congresses.
Mexican-American Border Region--Social conditions--Congresses.
Mexico--Foreign economic relations--United States--Congresses.
United States--Foreign economic relations--Mexico--Congresses.
Princeton subject headings:
Mexican-American Border Region--Commerce--Congresses.
Mexican-American Border Region--Economic conditions--Congresses.
Mexican-American Border Region--Population--Congresses.
Mexican-American Border Region--Social conditions--Congresses.
Mexico--Foreign economic relations--United States--Congresses.
United States--Foreign economic relations--Mexico--Congresses.