Columbia subject headings:
Harvard subject headings:
Arno River (Italy)--History.
City planning--Italy--Florence
Floods--Italy--Florence--History--20th century.
Florence (Italy)--History--1945-
Princeton subject headings:
Arno River (Italy)--History.
City planning--Italy--Florence.
Floods--Italy--Florence--History--20th century.
Florence (Italy)--History--1945-