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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Riddell, William Renwick,
    Publication info: Edinburgh?, Botanical Society of Edinburgh?, 1915?
    Holding Institution: Canadiana.org
  2. By: Riddell, William Renwick, - Emmons, Samuel B.
    Publication info: Edinburgh?, Botanical Society of Edinburgh?, 1919?
    Holding Institution: Canadiana.org