Columbia subject headings:
Harvard subject headings:
Dissenters--Germany (East)--Biography.
Germany (East)--Emigration and immigration.
Germany (East)--Politics and government.
Germany (East)--Social conditions.
Political refugees--Germany (East)--Biography.
Princeton subject headings:
Dissenters--Germany (East)--Biography.
Germany (East)--Politics and government.
Germany (East)--Social conditions.
Hoffmann, Constantin.
Political refugees--Germany (East)--Biography.