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  1. By: Ruth, Robert H.
    Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1970
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Ruth, Robert H. - Yoder, Ray A. - 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, 1953
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Harris, A. S. - Ruth, Robert H.
    Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1970
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Ruth, Robert H. - 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, 1957
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library