Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects--Mexico--Congresses
Mexico--Commerce--North America--Congresses.
North America--Commerce--Mexico--Congresses.
North American Free Trade Agreement--Congresses.
Produce trade--Mexico--Congresses.
Princeton subject headings:
Agriculture and state--Mexico.
Agriculture--Mexico.
Free trade--Canada.
Free trade--Mexico.
Free trade--United States.
Produce trade--Government policy--Canada.
Produce trade--Government policy--Mexico.
Produce trade--Government policy--United States.