Shows that constant maintenance of equipment is necessary for satisfactory and successful film projection. We digitized and uploaded this film from the A/V Geeks 16mm Archive. Email us at footage@avgeeks.com…

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Reports on large-scale production of electricity from underground heat. Describes studies aimed at forestalling harmful effects of geothermal power production being carried out in California’s Imperial Valley and provides a…

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Divides sea life into three groups–plankton, bottom dwellers and free swimmers. Shows how various animals capture food and protect themselves against natural enemies. Explains how sea life must depend upon…

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