Columbia subject headings:
Harvard subject headings:
Environmental policy--Germany (East)
Germany (East). Ministerium für Staatssicherheit
Germany--History--Unification, 1990--Environmental aspects.
Pollution--Germany (East)
Protest movements--Germany (East)
Secret service--Germany (East)--History
Princeton subject headings:
Environmental degradation--Germany (East).
Environmental protection--Germany (East)--Citizen participation.