Columbia subject headings:
City planning--United States--History--20th century.
Open spaces--United States.
Plazas--United States.
Harvard subject headings:
City planning--United States--History--20th century
Open spaces--United States.
Plazas--United States.
Princeton subject headings:
City planning--United States--History--20th century.
Open spaces--United States.
Plazas--United States.