Columbia subject headings:
Berlin (Germany)--International status.
German reunification question (1949-1990)
Germany (East)--International status.
Germany (West)--International status.
Harvard subject headings:
Berlin (Germany)--International status
German reunification question (1949-1990)
Germany (East)--International status.
Germany (West)--International status.
Princeton subject headings:
Berlin (Germany)--International status.
German reunification question (1949-1990)
Germany (East)--International status.
Germany (West)--International status.