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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ernst, Richard L. - Marquis, David A., - Northeastern Forest Experiment Station (Radnor, Pa.) - United States. Forest Service.
    Publication info: Broomall, Pa, Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1979
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library