Columbia subject headings:
Harvard subject headings:
Criminal investigation--Germany--Düsseldorf--History--20th century.
Criminal investigation--Germany--North Rhine-Westphalia--History--20th century.
Düsseldorf (Germany)--History--20th century.
Düsseldorf (Germany)--Social conditions--20th century.
National socialism--Germany--Düsseldorf.
North Rhine-Westphalia (Germany)--History--20th century.
North Rhine-Westphalia (Germany)--Social conditions--20th century.
Police--Germany--Düsseldorf--History--20th century.
Police--Germany--North Rhine-Westphalia--History--20th century.
Princeton subject headings:
Düsseldorf (Germany)--History--20th century.
Düsseldorf (Germany)--Social conditions--20th century.
Förderkreis Mahn- und Gedenkstätte Düsseldorf.
Holocaust memorials--Germany--Düsseldorf Region--History.
Holocaust, Jewish (1939-1945)--Germany--Düsseldorf Region--History.
Memorials--Germany--Düsseldorf Region--History.
North Rhine-Westphalia (Germany)--History--20th century.
North Rhine-Westphalia (Germany)--Social conditions--20th century.
Police--Germany--Düsseldorf--20th century.
Police--Germany--Düsseldorf--North Rhine-Westphalia--20th century.