• 30 Videos, Slides, Films

• 28 Lungs
• 16 Respiratory tract diseases
• 9 Self-care, Health
• 5 Effect of human beings on
• 5 Nature
• 5 Pollution
• 4 Atmosphere
• 4 Health and hygiene
• 4 Human ecology
• 4 Weather
• 3 Conservation of natural resources
• 3 Ecosystem management
• 3 Medical microbiology
• 3 Medicine
• 3 Refuse and refuse disposal
• 3 Research
• 3 Toxicology
• 3 Waste disposal
• 3 Water
• 2 Air
• 2 Asthma in children
• 2 Children
• 2 Climatic changes

• 30 Films Media Group
• 10 Information Television Network
• 6 A.D.A.M., Inc
• 4 Infobase
• 3 DR TV (Television station : Copenhagen, Denmark)
• 2 ABC News Productions
• 2 Meridian Education Corporation
• 1 ABC International
• 1 Ayres, Ian
• 1 BBC Worldwide Ltd
• 1 Connell Creations (Firm)
• 1 Krames StayWell, LLC
• 1 Orzel, Virginia
• 1 White Fox (Firm)

• 30 English

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