Columbia subject headings:
Architecture--Spain--Bilbao--History--19th century.
Architecture--Spain--Bilbao--History--20th century.
Harvard subject headings:
Architecture, Modern--19th century--Spain--Bilbao.
Architecture, Modern--20th century--Spain--Bilbao.
Architecture--Spain--Bilbao--History--Designs and plans.
Bilbao (Spain)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Modern--19th century--Spain--Bilbao.
Architecture, Modern--20th century--Spain--Bilbao.
Bilbao (Spain)--Buildings, structures, etc.
City planning--Spain--Bilbao.