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  1. By: Campbell, Dan L.
    Publication info: Portland, Or. (809 NE Sixth Avenue, Portland 97232) :Pacific Northwest Forest and Range Experiment Station,1981.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Radwan, M. A., - Campbell, Dan L. - Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
    Publication info: Portland, Or. :Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service,1981.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library