Columbia subject headings:
Harvard subject headings:
Madrid (Spain)--History.
Retiro (Madrid, Spain)--History.
Salamanca (Madrid, Spain)--History.
Urbanization--Spain--Madrid--History.
Princeton subject headings:
City planning--Spain--Madrid--History--19th century.
City planning--Spain--Madrid--History--20th century.
Madrid (Spain)--Social conditions--19th century.
Madrid (Spain)--Social conditions--20th century.
Middle class--Spain--Madrid--History--19th century.
Middle class--Spain--Madrid--History--20th century.