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  1. By: Lewis, Robert E., - Maser, Chris. - Pacific Northwest Forest and Range Experiment Station (Portland, Or.) - United States. Bureau of Land Management.
    Publication info: [Portland, Or.?] :U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station,[1981]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Li, C. Y. - Maser, Chris. - Pacific Northwest Research Station (Portland, Or.)
    Publication info: Portland, Or. :U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station,1986.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library