Columbia subject headings:
Dortmund (Germany)--History.
Duisburg (Germany)--History.
Neuss (Germany)--History.
Soest (Germany)--History.
Harvard subject headings:
Princeton subject headings:
Dortmund (Germany)--History.
Duisburg (Germany)--History.
Neuss (Germany)--History.
Soest (Germany)--History.