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  1. 1
    Global freshwater quality : a first assessment / edited by Michel Meybeck, Deborah V. Chapman, Richard Helmer.
    Published 1989
    “...Published on behalf of the World Health Organization and the United Nations Environment Programme...”
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  2. 2
    Surveillance of drinking water quality in rural areas / Barry Lloyd, Richard Helmer.
    by Lloyd, Barry
    Published 1991
    “...Longman Scientific & Technical on behalf of the World Health Organization and the United Nations...”
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