Columbia subject headings:
Actors--Italy--Congresses.
Grasso, Giovanni, -1930--Stage history--Congresses.
Musco, Angelo, 1871-1937--Stage history--Congresses.
Theater--Italy--History--20th century.
Harvard subject headings:
Grasso, Giovanni, -1930--Criticism and interpretation.
Musco, Angelo, 1871-1937--Criticism and interpretation.
Theater--Italy--Sicily--History.
Princeton subject headings: