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- Psychotherapy.net162
- Films for the Humanities & Sciences (Firm)106
- Infobase103
- Infobase, film distributor52
- American Academy of Pediatrics, production company41
- British Broadcasting Corporation, production company40
- Teletime Video, Inc37
- Carlson, Jon34
- BBC Worldwide Learning, film distributor30
- BBC Worldwide Ltd., film distributor27
- BBC Worldwide Ltd24
- Winston, Robert M. L.22
- British Broadcasting Corporation20
- Metzl, Jordan D., 1966-20
- Public Broadcasting Service (U.S.)20
- TV Choice Productions, production company18
- Annenberg Learner (Firm), publisher16
- Open University, production company16
- Kjos, Diane15
- New Video Group14