Columbia subject headings:
Cities and towns--Growth--Congresses.
City planning--Congresses.
Metropolitan areas--Congresses.
Urbanization--Congresses.
Harvard subject headings:
Cities and towns--Growth--History--20th century--Congresses.
City planning--History--20th century--Congresses.
Metropolitan areas--History--20th century--Congresses.
Urbanization--History--20th century--Congresses.
Princeton subject headings:
Cities and towns in art.
City planning--History.
Metropolitan areas--History.