Columbia subject headings:
Harvard subject headings:
Germany--History--1933-1945--Congresses.
Germany--Politics and government--1933-1945--Congresses.
Police--Germany--History--20th century--Congresses.
Princeton subject headings:
Germany--History--20th century--Congresses.
Germany--Politics and government--1933-1945--Congresses.
Germany. Geheime Staatspolizei--Congresses.
National socialism--Congresses.
Police--Germany--History--20th century--Congresses.