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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Agricola, Georg, - Hoover, Herbert, - Hoover, Lou Henry,
    Publication info: London, The Mining magazine, 1912
    Holding Institution: University of California Libraries
  2. By: Agricola, Georg, - Hoover, Herbert,
    Edition: [New ed.]
    Publication info: New York, Dover Publications, 1950
    Holding Institution: MBLWHOI Library