Columbia subject headings:
Architecture--Italy--History--20th century.
Milan (Italy)--Buildings, structures, etc.
Nervi, Pier Luigi.
Pirelli, società per azioni.
Skyscrapers--Italy--Milan.
Tall buildings--Italy--Milan.
Harvard subject headings:
Architecture--Italy--History--20th century
Architecture--Italy--History--20th century.
Milan (Italy)--Buildings, structures, etc.
Nervi, Pier Luigi
Pirelli, società per azioni
Pirelli, società per azioni.
Skyscrapers--Italy--Milan.
Skyscrappers--Italy--Milan.
Tall buildings--Italy--Milan.
Princeton subject headings: