Columbia subject headings:
Harvard subject headings:
Free trade--North America--Congresses
Industries--Mexican-American Border Region--Congresses.
Mexican-American Border Region--Economic conditions--Congresses.
Mexico--Commerce--United States--Congresses.
North American Free Trade Agreement--Congresses.
United States--Commerce--Mexico--Congresses.
Princeton subject headings:
Free trade--Mexico--Congresses.
Free trade--United States--Congresses.
Mexico--Boundaries--United States--Congresses.
Mexico--Foreign economic relations--United States--Congresses.
North America--Economic integration--Congresses.
United States--Boundaries--Mexico--Congresses.
United States--Foreign economic relations--Mexico--Congresses.