Columbia subject headings:
Architects--United States--Statistics.
Architectural firms--United States--Statistics.
Architecture--United States--Statistics.
Harvard subject headings:
Architects--United States--Statistics.
Architectural firms--United States--Statistics.
Architecture--United States--Statistics.
Princeton subject headings:
Architects--United States--Statistics.
Architectural firms--United States--Statistics.
Architectural practice--United States--Statistics.
Architectural services marketing--United States.