Columbia subject headings:
Harvard subject headings:
Architecture--Spain--Barcelona--History.
City planning--Spain--Barcelona--History--19th century.
Eixample (Barcelona, Spain)--Buildings, structures, etc.
Symmetry
Princeton subject headings:
Architecture--Spain--Barcelona--History--19th century.
City planning--Spain--Barcelona--History--19th century.
Eixample (Barcelona, Spain)--Buildings, structures, etc.
Symmetry.