A list of all shorts in which Betty Boop or early Betty prototypes appear. Covers the Betty Boop, Talkartoon and Screen Song series of shorts.
Ten recommends from me to get you started:
Bimbo's Initiation (1931)
Dizzy Red Riding-Hood (1931)
Mother Goose Land (1933)
I Heard (1933)
The Old Man and the Mountain (1933)
Making Stars (1935)
Out of the Inkwell (1938)
Sally Swing (1938)
(Personally still to see: You try somebody else, Time on my Hands)
Unavailable: Betty Boop Series 81 - Buzzy Boop at the Concert (1938). Considered lost I think.Some internet sources say a copy exists in Russia, but not sure if this is true.