Columbia subject headings:
Berlin (Germany)--International status.
Berlin (Germany)--Politics and government--1945-1990.
Transit, International.
Harvard subject headings:
Berlin (Germany)--International status
Berlin (Germany)--Politics and government--1945-1990
Transit, International.
Princeton subject headings:
Berlin (Germany)--International status.
Berlin (Germany)--Politics and government--1945-1990.
Transit, International.