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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 (archive.org)
  2. By: Blake, W. H. (William Hume),
    Publication info: Toronto :Macmillan,1922.
    Holding Institution: University of Toronto - Gerstein Science Information Centre