Columbia subject headings:
Cities and towns--Europe--History--Congresses.
Public spaces--Europe--History--Congresses.
Harvard subject headings:
Cities and towns--Europe--History--Congresses
City planning--Europe--History--Congresses.
Public spaces--Europe--History--Congresses.
Princeton subject headings:
Cities and towns--Europe--History--Congresses.
Public spaces--Europe--History--Congresses.