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Please read BHL's Acknowledgment of Harmful Content
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  1. By: United States. Department of the Interior. - Yard, Robert Sterling,
    Publication info: Washington, Govt. Print. Off, 1916
    Holding Institution: Smithsonian Libraries and Archives
  2. By: Yard, Robert Sterling,
    Publication info: New York, C. Scribner's Sons, 1928
    Holding Institution: Prelinger Library