Columbia subject headings:
Harvard subject headings:
Dictatorship--Germany (East)
Germany--History--Unification, 1990.
Potsdam (Germany)--History--20th century.
Revolutions--Germany--Potsdam--History--20th century.
Princeton subject headings:
Germany (East)--Politics and government--1989-1990.
Opposition (Political science)--Germany (East)--History.
Potsdam (Germany)--History--20th century.
Potsdam (Germany)--Politics and government.