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  1. By: Bollen, W. B. (Walter Beno),
    Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, [1969]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Bollen, W. B. (Walter Beno), - Lu, K. C. - 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, 1970
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Bollen, W. B. (Walter Beno), - Lu, K. C. - Tarrant, Robert F., - Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
    Publication info: [Portland, Or.], Pacific North West Forest and Range Experiment Station, [1970]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Bollen, W. B. (Walter Beno), - Tu, C. M. (Chin Ming), - 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, 1971
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library