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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Gregson, John D. - University of Alberta. Department of Zoology.
    Publication info: [Edmonton, Alberta], University of Alberta, [1936]
    Holding Institution: University of Alberta Library
  2. 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)