Columbia subject headings:
Canals--Italy--Milan--History--Pictorial works.
Canals--Italy--Milan--History.
Leonardo, da Vinci, 1452-1519.
Milan (Italy)--History--Pictorial works.
Milan (Italy)--History.
Harvard subject headings:
Canals--Italy--Milan--History--Pictorial works.
Canals--Italy--Milan--History.
Leonardo, da Vinci, 1452-1519
Milan (Italy)--History
Milan (Italy)--History--Pictorial works.
Princeton subject headings:
Canals--Italy--Milan--History--Pictorial works.
Canals--Italy--Milan--History.
Leonardo, da Vinci, 1452-1519.
Milan (Italy)--History--Pictorial works.
Milan (Italy)--History.