Columbia subject headings:
Harvard subject headings:
Architecture--Spain--Madrid--Congresses.
Art--Spain--Madrid--Congresses.
Madrid (Spain)--Civilization--Congresses.
Madrid (Spain)--Intellectual life--Congresses.
Urbanization--Spain--Madrid--History--Congresses.
Princeton subject headings:
Architecture--Spain--Madrid--Congresses.
Art--Spain--Madrid--Congresses.
Madrid (Spain)--Civilization--Congresses.
Madrid (Spain)--Intellectual life--Congresses.
Urbanization--Spain--Madrid--History--Congresses.