Columbia subject headings:
Harvard subject headings:
Architects--Congresses--Congresses.
Architecture--Italy--20th century--Congresses.
Gellner, Edoardo, 1909---Criticism and interpretation--Congresses.
Gellner, Edoardo--Congresses.
Mattei, Enrico, 1906-1962--Congresses.
Princeton subject headings:
Gellner, Edoardo--Congresses.
Mattei, Enrico, 1906-1962--Congresses.