Columbia subject headings:
Fortification--Europe--History--15th century--Congresses.
Fortification--Europe--History--16th century--Congresses.
Military architecture--Europe--History--15th century--Congresses.
Military architecture--Europe--History--16th century--Congresses.
Military architecture--Italy--History--15th century--Congresses.
Military architecture--Italy--History--16th century--Congresses.
Harvard subject headings:
Fortification--Europe--History--15th century--Congresses.
Fortification--Europe--History--16th century--Congresses.
Leonardo, da Vinci, 1452-1519--Influence--Congresses.
Military architecture--Europe--History--15th century--Congresses.
Military architecture--Europe--History--16th century--Congresses.
Princeton subject headings:
Fortification--Europe--History--15th century--Congresses.
Fortification--Europe--History--16th century--Congresses.
Leonardo, da Vinci, 1452-1519--Influence--Congresses.
Military architecture--Europe--History--15th century--Congresses.
Military architecture--Europe--History--16th century--Congresses.