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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Canada. Department of Agriculture. Entomology and Pathology Branch. - Carroll, W. J. (William Joseph),
    Publication info: Ottawa [Queen's Printer] 1958
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
    Subjects: Balch, R. E  Balsam woolly aphid