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  1. By: Darr, David R. - Fight, Roger D.
    Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, Forest Sevice, U.S. Dept. of Agriculture, 1974
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Randall, Robert M. - Darr, David R. - Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
    Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, [1974]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Darr, David R. - 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, 1975
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Darr, David R. - Fahey, Thomas D. (Thomas Daniel), - Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
    Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1973 [i.e. 1976]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library