• 23 Videos, Slides, Films

• 11 Human geography
• 8 Conservation of natural resources
• 8 Effect of human beings on
• 8 Human ecology
• 8 Nature
• 7 Environmental protection
• 7 Social life and customs
• 7 Water
• 6 Environmental aspects
• 6 Environmental geography
• 6 International economic relations
• 6 Natural resources
• 6 Pollution
• 5 Hydrology
• 5 Landforms
• 5 Physical geography
• 5 Refuse and refuse disposal
• 5 Social ecology
• 5 Toxicology
• 5 Waste disposal
• 4 Economic conditions
• 4 Economic geography
• 4 Population policy

• 18 Films Media Group
• 18 Films for the Humanities & Sciences (Firm)
• 6 Parthenon Entertainment (Firm)
• 4 Alexander Street Press
• 4 Moyers, Bill D
• 4 Sunrise Media LLC
• 3 Network Ireland Television
• 1 Ackroyd, David
• 1 Agency for Instructional Technology
• 1 American Public Television
• 1 Arts and Entertainment Network
• 1 Corajoud, Marie-Jose
• 1 Dennis, Aaron
• 1 Dennis, Chelsea Bay
• 1 German United Distributors
• 1 History Channel (Television network)
• 1 In Fine Films
• 1 Journeyman Pictures (Firm)
• 1 Kanpai Productions
• 1 Mills, Dan (Composer)
• 1 New Video Group
• 1 Valenti, Alexandre
• 1 WNET (Television station : New York, N.Y.)

• 22 English
• 3 Spanish
• 1 French

• 7 United States
• 3 China
• 2 Costa Rica
• 2 Latin America
• 1 Africa
• 1 Africa, North
• 1 Amazon River
• 1 Asia
• 1 Bolivia
• 1 Brazil
• 1 East Asia
• 1 Ecuador
• 1 Europe
• 1 Great Plains
• 1 Guatemala
• 1 India
• 1 Mexico
• 1 Peru
• 1 South America
• 1 South Asia
• 1 West Indies

Limit year range