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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Walker, J. C. (John Charles),
    Publication info: Washington, Govt. print. off, 1921
    Holding Institution: Library of Congress
  2. By: Walker, J. C. (John Charles),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1922
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library