Title
- One Sunday Afternoon (Warner Bros.)7
- One Thrilling Night (Monogram)5
- One Way Passage (Warner Bros.)9
- Operation Crossbow (MGM)5
- Opportunities in the motion picture industry : and how to qualify for positions in its many branches66
- Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine288
- Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures288
- Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration261
- Optische Spielwaaren und Lehrmittel: Laterna-Magica. Nebelbilder-Apparate. Sciopticons. Kinematrographen. Grosse Collection neuester Bilderserien. Stereoscope. Loupen und Lesegläser0
- Oregon School of the Air Broadcast Guide20
- Our Man Flint (20th Century Fox)2
- Our Town (United Artists)20
- Our master's voice: advertising104
- Our movie made children84
- Out of Sight (Universal Pictures)8
- Out of the Fog (Warner Bros.)9
- Outlaw Trail (Monogram)2
- Outline for TV Conference and Studio Dedication Program1
- Outward Bound (Warner Bros.)14
- Over the Goal (Warner Bros.)4