Columbia subject headings:
Harvard subject headings:
Cities and towns--Europe--History--Congresses
Sociology, Urban--Congresses.
Urban ecology (Sociology)--Europe--History--Congresses.
Urban policy--Europe--History--Congresses.
Princeton subject headings:
Cities and towns--Europe--History--Congresses.
Housing--Europe--History--Congresses.
Land use, Urban--Europe--History--Congresses.