Columbia subject headings:
Harvard subject headings:
Comedians--United States--History.
Comedy films--History and criticism
Commedia dell'arte
Marx Brothers.
Theater--History.
Vaudeville--United States--History.
Princeton subject headings:
Comedians--United States--History.
Comedy films--History and criticism.
Commedia dell'arte.
Marx Brothers.
Theater--History.
Vaudeville--United States--History.