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  1. 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
  2. By: Bates, Carlos G. (Carlos Glazier), - Pierce, Roy G. (Roy Gifford),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Forest Service, 1913
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library