Columbia subject headings:
Architecture--United States--History--20th century.
Modern movement (Architecture)--United States.
Visitors' centers--United States--History.
Harvard subject headings:
Architecture--United States--History--20th century
Modern movement (Architecture)--United States.
Visitors' centers--United States--History.
Princeton subject headings:
Architecture--United States--History--20th century.
Modern movement (Architecture)--United States.
Visitors' centers--United States--History.