Columbia subject headings:
Archaeology, Medieval--Germany--Ruhr (Region)
Excavations (Archaeology)--Germany--Ruhr (Region)
Isenburg Site (Essen, Germany)
Isenburg Site (Hattingen, Germany)
Ruhr (Germany : Region)--Antiquities.
Harvard subject headings:
Archaeology, Medieval--Germany--Ruhr (Region)
Excavations (Archaeology)--Germany--Ruhr (Region)
Isenburg Site (Essen, Germany)
Isenburg Site (Hattingen, Germany)
Ruhr (Germany : Region)--Antiquities.
Princeton subject headings: