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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Twinn, C. R. (Cecil Raymond) - Canada. Department of Agriculture. Science Service.
    Publication info: Ottawa, Canada Department of Agriculture, 1956
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  2. By: Peterson, L. O. T. - Canada. Department of Agriculture. Science Service.
    Publication info: Ottawa, Department of Agriculture, 1957
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  3. By: MacNay, C. G. - Canada. Department of Agriculture. Science Service.
    Publication info: Ottawa, Services des Sciences, Division de l'entomologie, Ministère de l'agriculture du Canada, 1955
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  4. By: Gregson, John D. - Canada. Department of Agriculture. Science Service.
    Publication info: [Ottawa], Queen's Printer, 1956
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  5. By: Balch, R. E. (Reginald Ernest), - Canada. Department of Agriculture. Science Service.
    Publication info: Ottawa, Canada Department of Agriculture, 1958
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)