Groucho, Chico and Harpo. The Cocoanuts (1931, Robert Florey).
Groucho, Sig Ruman, Harpo, Leonard Ceeley, Margaret Dumont, Chico. A Day at the Races (1937, Sam Wood).
Harpo Marx. Horse Feathers (Paramount-Publix Corp., 1932, directed by Norman McLeod).