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