Columbia subject headings:
Drawing, Italian--15th century--Exhibitions.
Leonardo, da Vinci, 1452-1519--Exhibitions.
Mechanical engineering--Early works to 1800--Exhibitions.
Harvard subject headings:
Drawing, Italian--15th century--Exhibitions.
Leonardo, da Vinci, 1452-1519--Exhibitions.
Mechanical engineering--Early works to 1800--Exhibitions.
Princeton subject headings:
Drawing, Italian--15th century--Exhibitions.
Leonardo, da Vinci, 1452-1519--Exhibitions.
Mechanical engineering--Early works to 1800--Exhibitions.