Problems of Conservation: Water 4.0 from 0 reviews
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Shows ways to increase water supplies: percolation ponds, desalination, and artificial weather control. Also points out the necessity of water pollution control.

Encyclopedia Britannica, 331 N. LaSalle St., Chicago, IL 60610, Phone: (312)347-7159, Toll-free: 800-323-1229, Fax: (312)294-2104, URL:

Available on Running time 16 minutes.

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Natural Resources
Encyclopedia Britannica Educational Corporation

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