Columbia subject headings:
Harvard subject headings:
Cities and towns--Growth--Congresses
Cities and towns--History--Congresses
City and town life--History--Congresses.
Metropolitan areas--History--Congresses.
Urbanization--History--Congresses.
Princeton subject headings:
Cities and towns--Growth--Congresses.
Cities and towns--History--Congresses.
City and town life--History--Congresses.
Metropolitan areas--History--Congresses.
Urbanization--History--Congresses.