Columbia subject headings:
Harvard subject headings:
Bad Godesberg (Bonn, Germany)--History.
Bonn (Germany)--Antiquities.
Castles--Germany--Bonn--Design and construction--History.
Castles--Germany--Bonn--History.
Excavations (Archaeology)--Germany--Bonn.
Godesburg (Bonn, Germany)--History.
Princeton subject headings:
Bad Godesberg (Bonn, Germany)--History.
Bonn (Germany)--Antiquities.
Castles--Germany--Bonn--Design and construction--History.
Castles--Germany--Bonn--History.
Excavations (Archaeology)--Germany--Bonn.