Columbia subject headings:
Architects--Europe.
Architects--United States.
Architecture--Europe--History--20th century.
Architecture--United States--History--20th century.
Harvard subject headings:
Architects--Europe.
Architects--United States
Architecture, Modern--20th century--Europe.
Architecture--United States--History--20th century
Princeton subject headings:
Architects--Europe.
Architects--United States.
Architecture, Modern--20th century--Europe.
Architecture--United States--History--20th century.