Columbia subject headings:
Harvard subject headings:
Germany (East)--Foreign relations--Soviet Union
Germany (East)--Politics and government
Internal security--Germany (East)
Soviet Union--Foreign relations--Germany (East)
Princeton subject headings:
Germany (East)--History.
Germany (East)--Politics and government--1989-1990.
Germany--Foreign relations--Soviet Union.
Internal security--Germany (East)
Soviet Union--Foreign relations--Germany.