Columbia subject headings:
Architecture--Europe--History--Congresses.
Cities and towns--Europe--History--Congresses.
City planning--Europe--History--Congresses.
Europe--Historical geography--Congresses.
Space (Architecture)--Europe--History--Congresses.
Harvard subject headings:
City planning--History--Congresses.
City planning--Political aspects--Congresses.
Regional planning--History--Congresses.
Regional planning--Political aspects--Congresses.
Princeton subject headings:
City planning--Political aspects--Congresses.
Regional planning--Political aspects--Congresses.