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  1. 1
    by Norse, Elliott A.
    Published 1990
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    Ancient forests of the Pacific Northwest /
  2. 2
    by Twight, Peter A.
    Published 1973
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    Ecological forestry for the Douglas Fir region.
  3. 3
    Published 1990
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    Three-state impact of spotted owl conservation and other timber harvest reductions : a cooperative evaluation of the economic and social impacts : based on independent studies at University of Washington, University of California, Oregon State University.

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