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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Olson, David P. - Langer, Clarence. - United States. State and Private Forestry. Northeastern Area.
    Publication info: [Broomall, Pa.], U.S. Dept. of Agriculture, Forest Service, Northeastern Area, [1981?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library