Columbia subject headings:
Harvard subject headings:
Drochtersen (Germany)--Antiquities.
Excavations (Archaeology)--Germany--Ritsch.
Kehdingen (Germany)--Antiquities.
Ritsch (Germany)--Antiquities.
Princeton subject headings:
Drochtersen (Germany)--Antiquities.
Excavations (Archaeology)--Germany--Drochtersen.
Excavations (Archaeology)--Germany--Ritsch.
Ritsch (Germany)--Antiquities.