Columbia subject headings:
Australia--Foreign economic relations--United States.
Free trade--Canada.
Free trade--Mexico.
Free trade--United States.
New Zealand--Foreign economic relations--United States.
United States--Foreign economic relations--Australia.
United States--Foreign economic relations--New Zealand.
Harvard subject headings:
Australia--Commerce.
Free trade--North America
International trade
New Zealand--Commerce.
North America--Commerce.
North America--Commercial policy.
North America--Foreign economic relations.
Princeton subject headings: