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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Smith, H. Clay. - Trimble, George R. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Upper Darby, Pa, Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1970
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Trimble, George R.
    Publication info: Upper Darby,
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library