Columbia subject headings:
Architecture, Modern--19th century--History.
Architecture, Modern--20th century--History.
Space (Architecture)--Philosophy.
Harvard subject headings:
Architecture, Modern--19th century
Architecture, Modern--20th century
Space (Architecture)--Philosophy.
Princeton subject headings:
Architecture, Modern--19th century--History.
Architecture, Modern--20th century--History.
Space (Architecture)--Philosophy.