Columbia subject headings:
Architecture--Spain--History--19th century.
Architecture--Spain--History--20th century.
Casas del Pueblo (Spain)--History.
Socialism and architecture--Spain--History.
Socialism--Spain--History.
Working-men's clubs--Spain--Buildings--History.
Harvard subject headings:
Architecture, Modern--Spain--History--20th century.
Casa del Pueblo de Madrid--History.
Casas del Pueblo (Spain)--History.
Clubhouses--Spain--Designs and plans--History--20th century.
Socialism--Spain--History
Working-men's clubs--Spain--Buildings--History--20th century.
Princeton subject headings:
Casa del Pueblo de Madrid--History.
Clubhouses--Spain--History--20th century.
Socialism--Spain--Societies, etc.--History--20th century.
Working-men's clubs--Spain--History--20th century.