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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Dunning, Duncan, - Hasel, A. A. (Austin Alexander), - California Forest and Range Experiment Station.
    Publication info: Berkeley, California, U.S. Department of Agriculture, Forest Service, California Forest and Range Experiment Station, 1945
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Dunning, Duncan,
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1923
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library