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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Dreyer, Georges, - Hanson, George Fulford.
    Publication info: New York city, P.B. Hoeber, 1921
    Holding Institution: University of California Libraries
  2. By: Dreyer, Georges, - Hanson, George Fulford,
    Publication info: London, Cassell, 1920
    Holding Institution: University of Toronto - Gerstein Science Information Centre