Columbia subject headings:
Motion pictures--Sound effects--History.
Radio broadcasting--Italy--History--20th century.
Sound motion pictures--Italy--History--20th century.
Harvard subject headings:
Motion pictures--Sound effects--History.
Radio broadcasting--Italy--History--20th century.
Sound motion pictures--Italy--History--20th century.
Princeton subject headings:
Motion pictures--Sound effects--History.
Radio broadcasting--Italy--History--20th century.
Sound motion pictures--Italy--History--20th century.