Columbia subject headings:
Berlin Wall, Berlin, Germany, 1961-1989.
Detente.
Germany (East)--Foreign relations.
Germany (East)--Politics and government.
Harvard subject headings:
Berlin Wall, Berlin, Germany, 1961-1989.
Detente.
Germany (East)--Foreign relations.
Germany (East)--Politics and government.
Princeton subject headings:
Berlin Wall, Berlin, Germany, 1961-1989.
Detente.
Germany (East)--Foreign relations.
Germany (East)--Politics and government.