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  1. By: Gratkowski, H. - 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, [1976]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Gratkowski, H. - 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, [1971]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Gratkowski, H. - 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, 1973
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Gratkowski, H. - 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, 1961
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library