Columbia subject headings:
Anti-Nazi movement--History.
Duisburg (Germany)--Politics and government.
Germany. Geheime Staatspolizei.
Harvard subject headings:
Anti-Nazi movement--History.
Duisburg (Germany)--Politics and government.
Germany. Geheime Staatspolizei
Princeton subject headings:
Anti-Nazi movement--History.
Duisburg (Germany)--Politics and government.
Germany. Geheime Staatspolizei