Columbia subject headings:
Dürer, Albrecht, 1471-1528--Exhibitions.
Fortification--Early works to 1800--Exhibitions.
Leonardo, da Vinci, 1452-1519--Notebooks, sketchbooks, etc.--Exhibitions.
Michelangelo Buonarroti, 1475-1564--Notebooks, sketchbooks, etc.--Exhibitions.
Military engineering--Early works to 1800--Exhibitions.
Harvard subject headings:
Dürer, Albrecht, 1471-1528--Exhibitions.
Fortification--Early works to 1800--Exhibitions.
Leonardo, da Vinci, 1452-1519--Notebooks, sketchbooks, etc.--Exhibitions.
Michelangelo Buonarroti, 1475-1564--Notebooks, sketchbooks, etc.--Exhibitions.
Military engineering--Early works to 1800--Exhibitions.
Princeton subject headings:
Dürer, Albrecht, 1471-1528--Exhibitions.
Fortification--Early works to 1800--Exhibitions.
Leonardo, da Vinci, 1452-1519--Notebooks, sketchbooks, etc.--Exhibitions.
Michelangelo Buonarroti, 1475-1564--Notebooks, sketchbooks, etc--Exhibitions.
Military engineering--Early works to 1800--Exhibitions.