Columbia subject headings:
Architecture--Spain--Madrid--History--20th century.
Architecture--Spain--Madrid.
Buildings--Spain--Madrid.
Madrid (Spain)--Buildings, structures, etc.
Madrid (Spain)--Guidebooks.
Harvard subject headings:
Architecture, Modern--20th century--Spain--Madrid.
Architecture--Spain--Madrid--History.
Functionalism (Architecture)--Spain--Madrid.
International style (Architecture)--Spain--Madrid.
Madrid (Spain)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Modern--20th century--Spain--Madrid.
Architecture--Spain--Madrid.
Buildings--Spain--Madrid.
Madrid (Spain)--Buildings, structures, etc.