Columbia subject headings:
Harvard subject headings:
Canada--Commercial policy.
Imports--Canada--Case studies.
Imports--United States--Case studies.
Industries--Canada--Case studies.
Industries--United States--Case studies.
United States--Commercial policy.
Princeton subject headings:
Canada--Commercial policy.
Imports--Canada--Case studies.
Imports--United States--Case studies.
Industries--Canada--Case studies.
Industries--United States--Case studies.
United States--Commercial policy.