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  1. 1
    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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  2. 2
    Moskva : Izd-vo "Nauka", 1979.
    173 p. ; 20 cm.
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  3. 3
    Published 1976
    Colombo : National Science Council of Sri Lanka, 1976.
    iii, 65 p. ; 25 cm.
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