Columbia subject headings:
Fortification--Designs and plans--Exhibitions.
Fortification--Italy--History--15th century--Exhibitions.
Fortification--Italy--History--16th century--Exhibitions.
Leonardo, da Vinci, 1452-1519--Exhibitions.
Michelangelo Buonarroti, 1475-1564--Exhibitions.
Harvard subject headings:
Fortification--Designs and plans--Exhibitions.
Fortification--Italy--History--15th century--Exhibitions.
Fortification--Italy--History--16th century--Exhibitions.
Fortification--Italy--History--Exhibitions.
Leonardo, da Vinci, 1452-1519--Exhibitions.
Michelangelo Buonarroti, 1475-1564--Exhibitions.
Princeton subject headings:
Fortification--Italy--Exhibitions.
Leonardo, da Vinci, 1452-1519.
Michelangelo Buonarroti, 1475-1564.
Military architecture--Italy--Exhibitions.