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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Drayton, F. L. - Dominion Experimental Farms and Stations (Canada)
    Publication info: Ottawa, Dept. of Agriculture, [1917?]
    Holding Institution: Canadiana.org
  2. By: Canada. Department of Agriculture. - Drayton, F. L. - Dominion Experimental Farms. Division of Botany.
    Publication info: Ottawa, F.A. Acland, Printer to the King's Most Excellent Majesty, 1926
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)