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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pearson, R. G. - Ontario. Air Resources Branch. Phytotoxicology Section.
    Publication info: [Toronto], Phytotoxicology Section, Air Resources Branch, 1990
    Holding Institution: Ontario Ministry of the Environment
    Subjects: Ontario  Phytotoxins  Plant diseases  Soils  Trace element content  Windsor