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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Blake, W. H. (William Hume),
    Publication info: Toronto, The Macmillan company of Canada, ltd, 1915
    Holding Institution: University of California Libraries
  2. By: Blake, W. H. (William Hume),
    Publication info: Toronto, Macmillan Co. of Canada, 1922
    Holding Institution: Internet Archive
  3. By: Blake, W. H. (William Hume),
    Publication info: Toronto, Macmillan, 1922
    Holding Institution: University of Toronto - Gerstein Science Information Centre