Columbia subject headings:
Harvard subject headings:
Germany (East)--Boundaries--Germany (West)
Germany (East)--Foreign relations--Germany (West)
Germany (East)--Politics and government.
Germany (East). Grenztruppen der DDR.
Germany (West)--Boundaries--Germany (East)
Germany (West)--Foreign relations--Germany (East)
Internal security--Germany (East)
Princeton subject headings:
Germany (East)--Boundaries--Germany (West)
Germany (West)--Boundaries--Germany (East)
Internal security--Germany (East)