Columbia subject headings:
Commerce--Environmental aspects--Congresses.
Environmental policy--Economic aspects--Congresses.
International trade--Environmental aspects--Congresses.
Harvard subject headings:
Commerce--Environmental aspects--Congresses.
Environmental policy--Economic aspects--Congresses
International trade--Environmental aspects--Congresses.
Princeton subject headings:
Commerce--Environmental aspects--Congresses.
Environmental policy--Economic aspects--Congresses.
International trade--Environmental aspects--Congresses.