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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Scientific Instrument Manufacturers' Association of Great Britain.
    Publication info: London, Constable, 1921
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Scientific Instrument Manufacturers' Association of Great Britain.
    Publication info: London, Constable and Company ltd, 1921
    Holding Institution: University of California Libraries