Columbia subject headings:
Riva, Umberto, 1928-2021.
Harvard subject headings:
Architects--Italy.
Architecture--Italy--History--20th century
Architecture--Italy--History--20th century.
Riva, Umberto, 1928-2021
Princeton subject headings:
Architecture--Italy--History--20th century.
Riva, Umberto, 1928-2021.