Columbia subject headings:
Architects--Spain--Madrid.
Architecture--Spain--Madrid--History--19th century.
Architecture--Spain--Madrid.
Harvard subject headings:
Architects--Spain--Madrid.
Architecture, Modern--19th century--Spain--Madrid.
Architecture--Spain--Madrid--History.
Architecture--Spain--Madrid.
Princeton subject headings:
Architects--Spain--Madrid.
Architecture, Modern--19th century--Spain--Madrid.
Architecture--Spain--Madrid.