Columbia subject headings:
Harvard subject headings:
Anti-Nazi movement--Germany--Lower Saxony--History--Sources.
Germany--Politics and government--1933-1945--Sources.
Germany. Geheime Staatspolizei--History--Sources.
Lower Saxony (Germany)--History--20th century--Sources.
Political crimes and offenses--Germany--Lower Saxony--History--Sources.
Princeton subject headings:
Germany--Politics and government--1933-1945--Sources.
Lower Saxony (Germany)--Politics and government--Sources.