Columbia subject headings:
Landscape design--Germany--Berlin--Congresses.
Landscape design--Germany--Potsdam--Congresses.
Harvard subject headings:
Landscape design--Germany--Berlin--Congresses.
Landscape design--Germany--Potsdam--Congresses.
Princeton subject headings:
Landscape design--Germany--Berlin--Congresses.
Landscape design--Germany--Potsdam--Congresses.