Columbia subject headings:
Free trade--North America--Bibliography.
Free trade--North America.
Industries--North America.
North America--Commerce.
North America--Economic integration--Bibliography.
North America--Economic integration.
North American Free Trade Agreement
Harvard subject headings:
Free trade--North America
Free trade--North America--Bibliography.
Industries--North America.
North America--Commerce.
North America--Economic integration
North America--Economic integration--Bibliography.
North American Free Trade Agreement
North American Free Trade Agreement--Bibliography.
Princeton subject headings:
Free trade--North America--Bibliography.
Free trade--North America.
Industries--North America.
North America--Commerce.
North America--Economic integration--Bibliography.
North America--Economic integration.
North American Free Trade Agreement