Columbia subject headings:
Free trade--Canada.
Free trade--Mexico.
Free trade--United States.
North American Free Trade Agreement
Harvard subject headings:
Free trade--Canada
Free trade--Mexico
Free trade--Mexico.
Free trade--United States
Free trade--United States.
North American Free Trade Agreement
Princeton subject headings:
Commercial treaties--Mexico.
Commercial treaties--North America.
Free trade--Mexico.
Free trade--North America.
North American Free Trade Agreement
Tariff--Mexico.
Tariff--North America.