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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ballard, C. W. (Charles William),
    Publication info: New York, Wiley, 1921
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Ballard, C. W. (Charles William),
    Publication info: New York, John Wiley & Sons, Inc.; [etc.,etc.], 1921
    Holding Institution: Cornell University Library