Columbia subject headings:
Harvard subject headings:
Border patrols--Germany (East)
Civil rights--Germany (East)
Germany (East)--Boundaries--Germany (West)
Political prisoners--Legal status, laws, etc.--Germany (East)
Princeton subject headings:
Border patrols--Germany (East).
Civil rights--Germany (East)
Germany (East)--Boundaries--Germany (West)
Political prisoners--Legal status, laws, etc.--Germany (East).