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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Bickford, C. A. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Upper Darby, Pa, Northeastern Forest Experiment Station, 1961
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Bickford, C. A. - Bull, Henry. - Southern Forest Experiment Station (New Orleans, La.)
    Publication info: New Orleans, La, USDA Forest Service, Southern Forest Experiment Station, 1935
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library