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Please read BHL's Acknowledgment of Harmful Content
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  1. By: British Science Guild. - Gregory, Richard, Sir,
    Publication info: London, British Science Guild, 1921
    Holding Institution: University of Toronto - Robarts Library
  2. By: British Science Guild. - Gregory, Richard, Sir,
    Publication info: London, British Science Guild, 1921
    Holding Institution: University of California Libraries
  3. By: Gregory, Richard, Sir,
    Publication info: London, Macmillan, 1916
    Holding Institution: University of Toronto - Robarts Library
  4. By: Gregory, Richard, Sir,
    Publication info: London, Macmillan and co., limited, 1916
    Holding Institution: University of California Libraries