Columbia subject headings:
Canada--Commercial policy.
Canada--Economic policy.
Canada--Foreign economic relations.
Environmental policy--Canada.
Harvard subject headings:
Canada--Commercial policy.
Canada--Economic policy.
Canada--Foreign economic relations.
Commercial policy--Environmental aspects
Environmental policy
Environmental policy--Canada
International trade--Environmental aspects
Princeton subject headings:
Canada--Commercial policy.
Canada--Economic policy.
Canada--Foreign economic relations.
Environmental policy--Canada.