Author
Infobase,
64
TVF International (Firm)
24
National Geographic Society (U.S.)
17
Public Broadcasting Service (U.S.)
13
BBC Worldwide Learning
2
Cable News Network
2
Films for the Humanities & Sciences (Firm)
2
Infobase
2
PBS (Firm)
2
3Boxmedia (Firm)
1
BBC Worldwide Ltd
1
Bocquet-Appel, Jean-Pierre
1
Connor, Melissa A.
1
Elizabeth Mermin (Firm)
1
Falling Walls Foundation (Firm)
1
Inside Science (Firm)
1
SpringerLink (Online service)
1