• 4 Videos, Slides, Films

• 4 Mathematics
• 4 Study and teaching
• 4 Vocational guidance
• 3 Chemistry
• 2 Anthropology
• 2 Applied mathematics
• 2 Crime
• 2 Engineering
• 2 Environmental sciences
• 2 Experiments
• 2 Geology
• 2 Methodology
• 2 Physical geography
• 2 Politics and government
• 2 Psychology
• 2 Research
• 2 Social control
• 2 Sociology
• 2 Technology
• 1 Anatomy
• 1 Astronomy
• 1 Dynamics

• 4 Films Media Group
• 2 Uniview Worldwide
• 1 Cambridge Educational (Firm)
• 1 Joy of Giving Something, Inc

• 4 English

• 2 United States

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