Columbia subject headings:
Architects--United States--Correspondence.
Wright, Frank Lloyd, 1867-1959--Correspondence.
Harvard subject headings:
Architects--In-service training--United States.
Architects--United States--Correspondence.
Wright, Frank Lloyd, 1867-1959.
Princeton subject headings:
Architects--United States--Correspondence.
Wright, Frank Lloyd, 1867-1959--Correspondence.