Uses St Louis, Missouri, as an example to show services performed by a big city, such as air and water purification, traffic control, health and safety programs, city planning and…

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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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Early United Airlines film fragment. We digitized and uploaded this film on behalf of the Prelinger Archives. Email us at footage@avgeeks.com if you have questions about the footage and are…

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