Columbia subject headings:
Collective bargaining--North America.
Free trade--North America.
Free trade--United States.
North America--Foreign economic relations--United States.
North American Free Trade Agreement
United States--Foreign economic relations--North America.
Harvard subject headings:
Collective bargaining--North America.
Free trade--North America
Free trade--United States
North America--Foreign economic relations--United States.
North American Free Trade Agreement
United States--Foreign economic relations--North America.
United States. North American Free Trade Agreement Implementation Act.
Princeton subject headings: