Columbia subject headings:
Environmental policy--Germany (West)--History--20th century.
Environmentalism--Germany (West)--History--20th century.
Harvard subject headings:
Environmental policy--Germany (West)--History--20th century.
Environmental policy--Germany (West)--History.
Environmentalism--Germany (West)--History--20th century.
Princeton subject headings:
Environmental policy--Germany (West)--History--20th century.
Environmentalism--Germany (West)--History--20th century.