Columbia subject headings:
Harvard subject headings:
Archaeology, Medieval--Portugal.
Archaeology, Medieval--Spain, Northern.
Castles--Portugal--History.
Castles--Spain, Northern--History.
Portugal--Antiquities.
Spain, Northern--Antiquities.
Princeton subject headings:
Archaeology, Medieval--Portugal.
Archaeology, Medieval--Spain, Northern.
Castles--Portugal--History.
Castles--Spain, Northern--History.
Portugal--Antiquities.
Spain, Northern--Antiquities.