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  1. By: Sorensen, Frank C.
    Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service, 1970
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Sorensen, Frank C. - Pacific Northwest Research Station (Portland, Or.)
    Publication info: Portland, Or. (333 S.W. First Avenue, P.O. Box 3890, Portland 97208-3890), U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [1994]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Weber, John C. - Sorensen, Frank C.
    Publication info: [Portland, Or.], U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1990
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library