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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Davis, R. O. E. (Royall Oscar Eugene),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1915
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Davis, R. O. E. (Royall Oscar Eugene),
    Publication info: [Washington, Govt. Print. Off.], 1912
    Holding Institution: University of California Libraries