Columbia subject headings:
Architecture, Modern--19th century--History.
Architecture, Modern--20th century.
City planning--History.
Harvard subject headings:
Architecture, Modern--19th century
Architecture, Modern--21st century
City planning--History--19th century.
City planning--History--20th century
Princeton subject headings:
Architecture, Modern--19th century--History.
Architecture, Modern--20th century.
City planning--History--19th century.
City planning--History--20th century.