• 7 Videos, Slides, Films

• 2 Historical films
• 1 Agriculture
• 1 Archaeology and natural disasters
• 1 Arms race
• 1 Asteroids
• 1 Climatic changes
• 1 Collisions with Earth
• 1 Communism
• 1 Depressions
• 1 Documentary films
• 1 Documentary television programs
• 1 Droughts
• 1 Dust storms
• 1 Effect of environment on
• 1 Effect of volcanic eruptions on
• 1 Environmental aspects
• 1 Environmental protection
• 1 Environmentalism
• 1 Epidemics
• 1 Feature films
• 1 Film adaptations
• 1 Health aspects
• 1 Human beings

• 4 WGBH (Television station : Boston, Mass.)
• 3 British Broadcasting Corporation
• 3 PBS Home Video
• 3 WGBH Video (Firm)
• 2 McCullough, David G
• 2 Woodard, Alfre, 1953-
• 1 3BM Television (Firm)
• 1 Blandick, Clara, 1881-1962
• 1 Bond, Ward, 1903-1960
• 1 Carradine, John
• 1 Channel Four (Great Britain)
• 1 Chowder, Ken
• 1 Colbert, Claudette
• 1 Drain, Margaret
• 1 Edmonds, Walter D. (Walter Dumaux), 1903-1998
• 1 Fonda, Henry, 1905-1982
• 1 Ford, John, 1894-1973
• 1 Forsythe, John, 1918-2010
• 1 Furneaux, Charles
• 1 Gazit, Chana
• 1 Hunt, Linda
• 1 Johnstone, Gary, 1959-
• 1 Kenner, Robert
• 1 Key Video (Firm)
• 1 Levien, Sonya, 1888?-1960

• 7 English

• 1 China
• 1 Great Plains
• 1 Mohawk River Valley (N.Y.)
• 1 United States

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