Columbia subject headings:
Canada--Commercial treaties.
Free trade--Canada.
Free trade--United States.
United States--Commercial treaties.
Harvard subject headings:
Canada--Commerce--United States.
Canada. Treaties, etc. 1988 January 2.
Free trade--Canada
Free trade--United States
United States--Commerce--Canada.
Princeton subject headings:
Canada--Commercial treaties.
Free trade--Canada.
Free trade--United States.
United States--Commercial treaties.