Columbia subject headings:
Harvard subject headings:
Hauptstaatsarchiv Düsseldorf--Catalogs.
North Rhine-Westphalia (Germany)--History--Sources--Catalogs.
Princeton subject headings:
Denazification--Sources--Catalogs.
Nordrhein-Westfälisches Hauptstaatsarchiv--Catalogs.
North Rhine-Westphalia (Germany)--History--Sources--Catalogs.