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  1. 1
    由 Norse, Elliott A.
    出版 1990
    圖書
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    Ancient forests of the Pacific Northwest /
  2. 2
    出版 1990
    圖書
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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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