Columbia subject headings:
City planning--Europe--History--16th century--Congresses.
Fortification--Europe--History--16th century--Congresses.
Military architecture--Europe--History--16th century--Congresses.
Harvard subject headings:
City planning--Europe--History--16th century--Congresses.
Fortification--Europe--History--16th century--Congresses.
Military architecture--Europe--History--16th century--Congresses.
Princeton subject headings: