Columbia subject headings:
Berlin Wall, Berlin, Germany, 1961-1989.
Germany (East)--Politics and government.
Germany (East)--Social conditions.
Harvard subject headings:
Berlin Wall, Berlin, Germany, 1961-1989.
Civil disobedience--Germany (East)
Germany (East)--Politics and government.
Government, Resistance to--Germany (East)
Opposition (Political science)--Germany (East)
Political persecution--Germany (East)
Protest movements--Germany (East)
Princeton subject headings: