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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hartley, Carl (Carl Pierce),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1913
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Hartley, Carl (Carl Pierce), - Pierce, Roy G. (Roy Gifford),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1917
    Holding Institution: Multiple institutions
  3. By: Hartley, Carl (Carl Pierce),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1921
    Holding Institution: Multiple institutions
  4. By: Hartley, Carl (Carl Pierce),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1915
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library