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