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