Columbia subject headings:
Harvard subject headings:
Germany (East)--Boundaries--Germany (West)
Germany (East)--Politics and government.
Germany (West)--Boundaries--Germany (East)
Germany--History--1945-1990.
Internal security--Germany (East)
Princeton subject headings:
Germany (East)--Boundaries--Germany (West)
Germany (East)--Politics and government.
Germany (West)--Boundaries--Germany (East)
Internal security--Germany (East)