Columbia subject headings:
Harvard subject headings:
Cologne (Germany)--History
EL-DE-Haus (Cologne, Germany)--History.
NS-Dokumentationszentrum (Historisches Archiv der Stadt Köln)--History.
National socialism--Germany--Cologne--History.
Princeton subject headings:
Cologne (Germany)--History.
NS-Dokumentationszentrum (Historisches Archiv der Stadt Köln)--History.
National socialism--Germany--Cologne--History.
Verein EL-DE-Haus--History.