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  1. By: Aho, Paul E. - Fiddler, Gary. - Filip, Gregory M. - Pacific Northwest Research Station (Portland, Or.)
    Publication info: [Portland, Or.] :U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station,1989.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Aho, Paul E. - 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,1974.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Li, C. Y. - Aho, Paul E. - Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
    Publication info: Portland, Or. :U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station,[1984]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library