Columbia subject headings:
Harvard subject headings:
Border crossing--Law and legislation--Germany (East)
Emigration and immigration law--Germany (East)
Internal security--Germany (East)
International travel regulations--Germany (East)
Political crimes and offenses--Germany (East)
Princeton subject headings:
Border crossing--Law and legislation--Germany (East).
Government, Resistance to--Law and legislation--Germany (East).
Illegal aliens--Germany (East).
International travel regulations--Germany (East).
Political crimes and offenses--Germany (East)