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  1. 1
    Initial thinning effects in 70- to 150-year-old douglas-fir-western Oregon and Washington /
    by Williamson, Richard L
    Published 1971

    Government Document Book
  2. 2
    Levels-of-growing-stock cooperative study on Douglas-fir
    by Williamson, Richard L
    Published 1971

    Government Document Book
  3. 3
    Levels-of-growing-stock cooperative study in Douglas-fir

    Government Document Book
  4. 4
    A cooperative level-of-growing-stock study in Douglas-fir /
    by Williamson, Richard L
    Published 1965

    Book
  5. 5
    Results of shelterwood harvesting of Douglas-fir in the Cascades of western Oregon /
    by Williamson, Richard L
    Published 1973

    Government Document Book
  6. 6
    Thinning response in 110-year-old Douglas-fir /
    by Williamson, Richard L
    Published 1966

    Government Document Book
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