Columbia subject headings:
Harvard subject headings:
Mexican-American Border Region--Economic conditions--Congresses.
Natural resources--Mexican-American Border Region--Congresses.
Pollution--Mexican-American Border Region--Congresses.
Princeton subject headings:
Environmental policy--Mexico--Congresses.
Environmental policy--United States--Congresses.
Environmental protection--Mexican-American Border Region--Congresses.
Mexican-American Border Region--Economic conditions--Congresses.
Natural resources--Mexican-American Border Region--Congresses.