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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hopf, Ludwig,
    Publication info: Breslau, J.U. Kern's verlag (M. Müller), 1904
    Holding Institution: University of California Libraries
  2. By: Hopf, Ludwig,
    Publication info: London, Longmans, 1909
    Holding Institution: University of Toronto - Robarts Library