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- Sadd, James16
- Jerome, Brian A.14
- Visual Learning Systems, production company14
- Camille S. DeBose (Firm)13
- Keck, Nina13
- MagellanTV, publisher13
- United States. Department of State, issuing body13
- Xiong, Jack, 1955-13
- American Public Television (APT) (Firm)12
- Butler, James J., Dr12
- National Research Council (U.S.). Space Studies Board12
- Annenberg Learner (Firm), publisher10
- Compagnie des taxi-brousse, production company10
- European Geosciences Union10
- Idéacom inc., production company10
- Lattanzio, Robert10
- Sadd, James (James Lester)10
- Barnes, William L.9
- Chaminé, Helder I.9
- SPIE (Society)9