Columbia subject headings:
Architects--Spain--Biography--Congresses.
Architecture--Spain--Historiography--Congresses.
Architecture--Spain--History--Congresses.
Harvard subject headings:
Architectural historians--Spain
Architecture--Spain--Historiography--Congresses.
Architecture--Spain--History.
Historians--Spain--History--20th century--Congresses.
Princeton subject headings:
Architectural historians--Spain--Congresses.
Architecture, Modern--20th century--Congresses.
Architecture--Spain--History--Congresses.