• 35 Videos, Slides, Films

• 32 Earth sciences
• 32 Geography
• 32 Landforms
• 32 Water use
• 16 Geology
• 13 Environmental sciences
• 13 Physical geology
• 10 Biotic communities
• 10 Ecological regions
• 10 Ecological zones
• 5 Earth (Planet)
• 5 Mantle
• 4 Outdoor recreation
• 4 Recreation
• 4 Recreation areas
• 3 Crust
• 3 Earth currents
• 3 Energy consumption
• 3 Energy development
• 3 Environmental aspects
• 3 Geodynamics
• 3 Geology, Structural
• 3 Lithosphere

• 35 Films Media Group
• 32 Infobase
• 13 Camille S. DeBose (Firm)
• 8 PBS (Firm)
• 5 National Geographic Digital Media (Firm)
• 3 Films for the Humanities & Sciences (Firm)
• 2 BBC (Firm)
• 2 Cerebellum Corporation (Firm)
• 1 A&E Networks (Firm)
• 1 Agency for Instructional Technology
• 1 American Geosciences Institute (Firm)
• 1 BBC Worldwide Ltd
• 1 Zarafa Films

• 35 English

• 2 Middle East
• 1 United Arab Emirates

Limit year range