Columbia subject headings:
Duisburg (Germany)--Antiquities.
Plant remains (Archaeology)
Wood products--Germany--Duisburg.
Harvard subject headings:
Duisburg (Germany)--Antiquities.
Plant remains (Archaeology)--Germany--Duisburg.
Wood products--Germany--Duisburg--History
Princeton subject headings:
Duisburg (Germany)--Antiquities.
Plant remains (Archaeology)
Wood products--Germany--Duisburg.