Columbia subject headings:
City planning--Environmental aspects--Congresses.
Sustainable development--Congresses.
Urban policy--Environmental aspects--Congresses.
Harvard subject headings:
City planning--Environmental aspects--Congresses
Sustainable development--Congresses
Urban policy--Environmental aspects--Congresses.
Princeton subject headings:
City planning--Environmental aspects--Congresses.
Sustainable development--Congresses.
Urban policy--Environmental aspects--Congresses.