Columbia subject headings:
Aeronautics.
Leonardo, da Vinci, 1452-1519--Knowledge and learning.
Harvard subject headings:
Aeronautics--History--Pictorial works.
Leonardo, da Vinci, 1452-1519--Knowledge--Aeronautics.
Princeton subject headings:
Aeronautics--History--Pictorial works.
Leonardo, da Vinci, 1452-1519--Knowledge--Aeronautics.