Columbia subject headings:
Berlin (Germany)--International status.
Berlin (Germany)--Politics and government--1945-1990.
Germany (East)--Foreign relations--Treaties.
Germany (West)--Foreign relations--Treaties.
Harvard subject headings:
Berlin (Germany)--International status
Berlin (Germany)--Politics and government--1945-1990
Germany (East)--Foreign relations--Treaties.
Germany (West)--Foreign relations--Treaties.
Princeton subject headings:
Berlin (Germany)--International status.
Berlin (Germany)--Politics and government--1945-1990.
Germany (East)--Foreign relations--Treaties.
Germany (West)--Foreign relations--Treaties.
Treaties.