Columbia subject headings:
Architecture--United States--History--20th century.
Skyscrapers--United States.
Tall buildings--United States.
Harvard subject headings:
Architecture--United States--History--20th century
Skyscrapers--United States.
Tall buildings--United States.
Princeton subject headings:
Architecture--United States--History--20th century.
Skyscrapers--United States.
Tall buildings--United States.