Columbia subject headings:
Harvard subject headings:
Home ownership--Germany--Duisburg--History.
Housing--Germany--Duisburg--History.
Working class--Dwellings--Germany--Duisburg--History.
Princeton subject headings:
Home ownership--Germany (West)--Duisburg--History.
Housing--Germany (West)--Duisburg--History.
Working class--Dwellings--Germany (West)--Duisburg--History.