Columbia subject headings:
Architectural drawing--United States--20th century.
Architecture--Environmental aspects--United States.
Caldwell, Alfred, 1903-1998.
Harvard subject headings:
Architects--United States--Biography
Architectural drawing--United States--20th century.
Architecture--Environmental aspects--United States.
Caldwell, Alfred, 1903-1998.
Princeton subject headings:
Architectural drawing--20th century--United States.
Architecture--Environmental aspects--United States.
Caldwell, Alfred, architect.