Columbia subject headings:
Harvard subject headings:
Germany (East)--Boundaries.
Germany (East)--Politics and government.
Germany (East). Grenztruppen der DDR--History.
Guards troops--Germany (East)--History.
National security--Germany (East)
Princeton subject headings:
Border security--Germany (East).
Germany (East)--Boundaries--Germany (West)
Germany (East). Grenztruppen der DDR
Germany (East). Ministerium für Staatssicherheit
Germany (West)--Boundaries--Germany (East)
Political persecution--Germany (East)