Deterioration of water
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Examines the phenomenon of polluted water by looking at sources of pollution; the role of the water cycle; methods of testing for pollutants; and purification method. Suitable for lower and middle secondary levels.
Copyright
Registered 21Jul72 · LP43062 (Jan-Jun 1974) Copyright holder: Learning Company of America, a division of Columbia Pictures Industries, Inc Production company: the American Meteorological Society
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