Columbia subject headings:
Borgia, Cesare, 1476?-1507.
Leonardo, da Vinci, 1452-1519.
Machiavelli, Niccolò, 1469-1527.
Harvard subject headings:
Diversion structures (Hydraulic engineering)--Italy--Arno River--History.
Florence (Italy)--History--1421-1737
Leonardo, da Vinci, 1452-1519
Machiavelli, Niccolò, 1469-1527
Water diversion--Italy--Arno River--History.
Princeton subject headings:
Borgia, Cesare, 1476?-1507.
Leonardo, da Vinci, 1452-1519.
Machiavelli, Niccolò, 1469-1527.