Author
SpringerLink (Online Service)
118
Infobase,
49
Films for the Humanities & Sciences (Firm)
35
Infobase
35
Trader Multimedia Inc. (Firm)
18
ScienceDirect (Online service)
10
United States. Environmental Protection Agency
10
United States. Environmental Protection Agency. Office of Air and Radiation
8
Public Broadcasting Service (U.S.)
7
Arts and Entertainment Network
6
Cambridge Educational (Firm)
6
United States. Environmental Protection Agency,
6
EBSCOhost
5
SpringerLink (Online service)
5
TVF International (Firm)
5
Goddard Space Flight Center
4
BBC Worldwide Ltd
3
Hack, Margherita
3
La Dous, Constanze
3
MVD (Firm)
3
ProQuest (Firm)
3
Stevenson, David S., 1968-
3
United States. Congress. Senate. Committee on Energy and Natural Resources
3
United States. Congress. Senate. Committee on the Judiciary. Subcommittee on Antitrust, Business Rights, and Competition
3
United States. Environmental Protection Agency. Office of Air and Radiation,
3
United States. Environmental Protection Agency. Office of the Inspector General
3
United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
3
Adams, Laurie
2
American Museum of Natural History
2
Astronomical Data Center (U.S.)
2
Australian Broadcasting Corporation
2
BBC (Firm)
2
Benz, Arnold, 1945-
2
Boffin, H. 1965-
2
Clark, David H.
2
Consortium for Energy Efficiency
2
Cram, Lawrence E.
2
Falkner, David E.,
2
Glasby, John S.
2
Glendenning, Norman K.
2
Golden, Frederic
2
Haster, Carl-Johan
2
Kaler, James B.
2
Kanas, Nick, 1945-
2
Keller, Thomas Everett,
2
Kippenhahn, Rudolf, 1926-
2
Kuhi, Leonard V.
2
National Air and Space Museum
2
National Renewable Energy Laboratory (U.S.),
2
National Research Council (U.S.). Task Group on Space Astronomy and Astrophysics
2
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