Columbia subject headings:
Harvard subject headings:
Architecture, Modern--20th century--Spain--Barcelona.
Architecture, Modern--21st century
Architecture--Spain--20th century.
Architecture--Spain--Barcelona.
Barcelona (Spain)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Modern--19th century--Spain--Barcelona.
Architecture, Modern--20th century--Spain--Barcelona.
Barcelona (Spain)--Buildings, structures, etc.
Modernism (Art)--Spain--Barcelona.