Columbia subject headings:
Cologne (Germany)--Antiquities--Exhibitions.
Excavations (Archaeology)--Germany--Cologne--Exhibitions.
Mineral industries--Germany--Cologne--Exhibitions.
Harvard subject headings:
Cologne (Germany)--Antiquities--Exhibitions.
Excavations (Archaeology)--Germany--Cologne--Exhibitions.
Princeton subject headings:
Cologne (Germany)--Antiquities--Exhibitions.
Excavations (Archaeology)--Germany--Cologne--Exhibitions.
Mineral industries--Germany--Cologne--Exhibitions.