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Author/Creator
- Annenberg Learner (Firm)13
- Harvard Environmental Economics Program13
- Harvard-Smithsonian Center for Astrophysics13
- Harvard-Smithsonian Center for Astrophysics. Science Media Group13
- Lewicke, Anna13
- Griswold, Alex9
- Mcelheny, Tobias4
- Bailey, L. H. (Liberty Hyde), 1858-19543
- Fernando, H. J. S.3
- Smil, Vaclav3
- British Broadcasting Corporation2
- Grainger, Clive A.2
- Jaupart, Claude2
- Mareschal, Jean-Claude, 1945-2
- Santos, F. D. (Filipe Duarte)2
- Association of Space Explorers1
- Bagenal, Fran, 1954-1
- Barro, Andri1
- Bascom, Willard1
- Boyd, Liona1