Columbia subject headings:
Architecture--Decision making.
Architecture--Spain--Barcelona--History--20th century.
Architecture--Spain--Barcelona.
Barcelona (Spain)--Buildings, structures, etc.
Harvard subject headings:
Architects--Spain--Barcelona.
Architecture, Modern--20th century--Spain--Barcelona.
Architecture--Decision making
Architecture--Spain--Barcelona--History.
Barcelona (Spain)--Buildings, structures, etc.
Princeton subject headings: