Columbia subject headings:
Berlin (Germany)--Politics and government--1945-1990.
Berlin (Germany)--Politics and government.
Germany (East)--Relations--Germany (West)
Germany (West)--Relations--Germany (East)
Harvard subject headings:
Berlin (Germany)--History--1945-1990
Berlin (Germany)--Politics and government--1945-1990
Germany (East)--Relations--Germany (West)
Germany (West)--Relations--Germany (East)
Princeton subject headings: