Columbia subject headings:
Engineering.
Leonardo, da Vinci, 1452-1519--Knowledge and learning.
Mechanical engineering--History.
Military engineering.
Harvard subject headings:
Leonardo, da Vinci, 1452-1519--Knowledge--Engineering.
Leonardo, da Vinci, 1452-1519--Knowledge--Mechanics.
Princeton subject headings:
Leonardo, da Vinci, 1452-1519--Criticism and interpretation.
Leonardo, da Vinci, 1452-1519--Knowledge and learning.