Author
Infobase,
69
Annenberg Learner (Firm)
13
Cerebellum Corporation
10
Public Broadcasting Service (U.S.)
10
Films for the Humanities & Sciences (Firm)
7
Infobase
7
BBC (Firm)
5
Arts and Entertainment Network
4
Palomar Community College District (Firm)
4
BBC Worldwide Ltd
3
National Geographic Society (U.S.)
3
Off the Fence Productions
3
American Geosciences Institute
2
Camille S. DeBose (Firm)
2
Canadian Broadcasting Corporation
2
Inside Science (Firm)
2
Video Education America
2
BBC Worldwide Learning
1
Bloomberg LP
1
Discovery Education (Firm)
1
Espresso TV (Firm)
1
Mazzarella Media (Firm)
1
NHK ENTERPRISES 21, INC. (Firm)
1
Québec/Amérique International
1
TMW Media Group
1
United States. National Aeronautics and Space Administration,
1