Columbia subject headings:
Castles--Denmark--Nyborg--History.
Nyborg (Denmark)--Buildings, structures, etc.
Nyborg (Denmark)--History.
Nyborg Slot (Nyborg, Denmark)
Harvard subject headings:
Castles--Denmark--Nyborg--History.
Excavations (Archaeology)--Denmark--Nyborg.
Fortification--Denmark--Nyborg--History.
Nyborg (Denmark)--History.
Nyborg Slot (Nyborg, Denmark)--History.
Princeton subject headings:
Castles--Denmark--Nyborg--History.
Nyborg (Denmark)--Buildings, structures, etc.
Nyborg (Denmark)--History.
Nyborg Slot (Nyborg, Denmark)