Columbia subject headings:
Hydraulic engineering--Italy--Arno River--History--16th century.
Hydraulic engineering--Italy--Arno River--History--To 1500.
Leonardo, da Vinci, 1452-1519.
Harvard subject headings:
Hydraulic engineering--Italy--Arno River--History--16th century.
Hydraulic engineering--Italy--Arno River--History--To 1500.
Leonardo, da Vinci, 1452-1519--Knowledge--Hydraulic engineering.
Princeton subject headings:
Hydraulic engineering--Italy--Arno River--History--16th century.
Hydraulic engineering--Italy--Arno River--History--To 1500.
Leonardo, da Vinci, 1452-1519.