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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Shigo, Alex L.,
    Publication info: Upper Darby, Pa, Northeastern Forest Experiment Station, 1962
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Shigo, Alex L.,
    Publication info: Upper Darby, Pa, USDA, Forest Service, [1976?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Shigo, Alex L., - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Broomall, PA, U.S. Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1984
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library