• 15 Videos, Slides, Films

• 12 Methodology
• 10 Study and teaching
• 9 Environmental sciences
• 7 Biology
• 7 Geology
• 7 Sociology
• 6 Chemistry
• 6 Physics
• 5 Experiments
• 4 Anthropology
• 4 Crime
• 4 Politics and government
• 4 Psychology
• 4 Science
• 4 Social control
• 3 Geography
• 3 History
• 3 Mathematics
• 3 Nationalism
• 3 Slopes (Physical geography)
• 3 Technology
• 3 Vocational guidance
• 2 Applied mathematics

• 15 Films Media Group
• 15 Films for the Humanities & Sciences (Firm)
• 4 Cambridge Educational (Firm)
• 4 Uniview Worldwide
• 3 BBC Worldwide Ltd
• 1 ABC International
• 1 Allegro Productions (Firm)
• 1 Ampersand Film & Video Tape Productions
• 1 Video Education Australasia

• 4 United States
• 3 Europe

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