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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Devito, Kevin John, - Dillon, P. J. - Ontario. Ministry of the Environment.
    Publication info: [Toronto], Queen's Printer for Ontario, 1992
    Holding Institution: Ontario Ministry of the Environment
    Subjects: Environment aspects  Lake ecology  Nitrogen  Nitrogen content  Ontario  Phosphorus  Phosphorus content  Stream ecology  Water