Columbia subject headings:
Europe--Social conditions--To 1492--Congresses.
Housing--Europe--History--Congresses.
Land use--Europe--History--Congresses.
Harvard subject headings:
Europe--Social conditions--To 1492--Congresses.
Housing--Europe--History--Congresses.
Land use--Europe--History--Congresses.
Princeton subject headings:
Europe--Social conditions--To 1492--Congresses.
Housing--Europe--History--Congresses.
Land use--Europe--History--Congresses.