Columbia subject headings:
Canada--Economic conditions--1991-
Free trade--North America.
Mexico--Economic conditions--1982-1994.
North America--Commercial policy.
United States--Economic conditions--1981-2001.
Harvard subject headings:
Canada--Commerce--Mexico.
Mexico--Commerce--Canada.
Mexico--Commerce--United States.
United States--Commerce--Mexico.
Princeton subject headings:
Canada--Economic conditions--1945-
Free trade--North America.
Mexico--Economic conditions--1982-1994.
Mexico--Foreign economic relations--Canada.
Mexico--Foreign economic relations--United States.
North America--Commercial policy.
United States--Economic conditions--1981-2001.
United States--Foreign economic relations--Canada.