Columbia subject headings:
City planning--United States--History--20th century.
Urban beautification--United States--History--20th century.
Harvard subject headings:
City planning--United States--History--20th century
Landscape architecture--United States--History--20th century.
Urban beautification--United States--History--20th century.
Princeton subject headings:
City planning--United States--History--20th century.
Urban beautification--United States--History--20th century.