Columbia subject headings:
Canada--Commerce.
Canada--Commercial policy--Environmental aspects.
Commercial policy--Environmental aspects.
Competition, International.
Environmental policy--Canada.
International trade--Environmental aspects.
Harvard subject headings:
Canada--Commerce--Environmental aspects--Congresses.
Canada--Commerce.
Canada--Commercial policy--Environmental aspects.
Commercial policy--Environmental aspects
Commercial policy--Environmental aspects--Congresses.
Competition, International
Environmental policy--Canada
Environmental policy--Canada--Congresses
International economic relations--Congresses
International trade--Environmental aspects
International trade--Environmental aspects--Congresses.
Princeton subject headings: