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  1. Countdown acid rain : future abatement strategies : summary report / report prepared by Air Resources Branch, Ontario Ministry of the Environment.
    By: Ontario. Air Resources Branch. - Ontario. Ministry of the Environment. - SENES Consultants Limited.
    Publication info: [Toronto, Ont.] :Queens Printer for Ontario,c1992.
    Holding Institution: Ontario Ministry of the Environment (archive.org)
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