Columbia subject headings:
Architecture, Medieval--England.
Architecture, Medieval--Wales.
Castles--England--History--To 1500.
Castles--Wales--History--To 1500.
Harvard subject headings:
Archaeology, Medieval--England.
Archaeology, Medieval--Wales.
Architecture, Medieval--England
Architecture, Medieval--Wales.
Castles--England--History--To 1500.
Castles--Wales--History--To 1500.
England--Antiquities.
Wales--Antiquities.
Princeton subject headings: