Columbia subject headings:
Architecture--Spain--País Vasco.
Historic buildings--Spain--País Vasco.
Monuments--Spain--País Vasco.
País Vasco (Spain)--History.
Harvard subject headings:
Architecture--Spain--País Vasco.
Historic buildings--Spain--País Vasco.
Monuments--Spain--País Vasco.
País Vasco (Spain)--History.
Princeton subject headings: