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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Spring, Samuel N. (Samuel Newton), - United States. Forest Service.
    Publication info: Washington, D.C, G.P.O, 1906
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Spring, Samuel N. (Samuel Newton),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Bureau of Forestry, 1905
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library