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Please read BHL's Acknowledgment of Harmful Content
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  1. By: White, Eric M., - Zarnoch, Stanley J. - English, Donald B. K. (Donald Blair Knapp), - Pacific Northwest Research Station (Portland, Or.)
    Publication info: Portland, OR, United States Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [2007]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: English, Donald B. K. (Donald Blair Knapp), - Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)
    Publication info: Fort Collins, Colo, U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, [1993]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library