Columbia subject headings:
Castles--France--Vernon (Eure)
Château de Vernon.
Fortification--France--Vernon (Eure)
Vernon (Eure, France)--Antiquities.
Vernon (Eure, France)--Buildings, structures, etc.
Harvard subject headings:
Castles--France--Vernon (Eure)
Château de Vernon.
Fortification--France--Vernon (Eure)
Vernon (Eure, France)--Antiquities.
Vernon (Eure, France)--Buildings, structures, etc.
Princeton subject headings: