Columbia subject headings:
Harvard subject headings:
Dissenters--Germany (East)
Escapes--Germany (East)--History.
Germany (East)--Emigration and immigration.
Germany (East)--History.
Princeton subject headings:
Dissenters--Germany (East).
Escapes--Germany (East)--History.
Germany (East)--Emigration and immigration.
Germany (East)--History.