Columbia subject headings:
Harvard subject headings:
Environmental policy--Germany--Congresses
Environmental protection--Germany--Congresses.
Nature conservation--Germany--Congresses.
Rat von Sachverständigen für Umweltfragen--History--Congresses.
Princeton subject headings:
Environmental policy--Germany--Congresses.
Environmental protection--Germany--Congresses.
Nature conservation--Germany--Congresses.
Rat von Sachverständigen für Umweltfragen--History--Congresses.