Columbia subject headings:
Cities and towns--Europe--History--Congresses.
Europe--Civilization--Congresses.
Europe--Economic conditions--Congresses.
Investments--Europe--History--Congresses.
Harvard subject headings:
Cities and towns--Europe--History--Congresses
City and town life--Europe--History--Congresses.
Europe--Civilization--Congresses.
Europe--Economic conditions--Congresses.
Fortification--Europe--History--Congresses.
Investments--Europe--History--Congresses.
Public investments--Europe--History--Congresses.
Princeton subject headings:
Cities and towns--Europe--History--Congresses.
Europe--Civilization--Congresses.
Europe--Economic conditions--Congresses.
Investments--Europe--History--Congresses.
Public investments--Europe--History--Congresses.
Urbanization--Europe--History--Congresses.