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  1. 1
    Published 1977
    [Toronto] : Ministry of the Environment, [1977]
    vii, 373 p. : ill. ; 30 cm.
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  2. 2
    Published 1980
    New Delhi : Central Board for the Prevention and Control of Water Pollution, 1980.
    107 p., [16] leaves of plates : ill., map ; 30 cm.
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