Columbia subject headings:
Harvard subject headings:
City planning--Social aspects--Germany--Berlin--Congresses.
Urban ecology (Sociology)--Germany--Berlin--Congresses.
Urbanization--Germany--Berlin--Congresses.
Princeton subject headings:
City planning--Social aspects--Germany--Berlin--Congresses.
Urban ecology (Sociology)--Germany--Berlin--Congresses.
Urbanization--Germany--Berlin--Congresses.