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  1. 1
    Major indicator shrubs and herbs on national forests of western Oregon and southwestern Washington /
    by Halverson, Nancy M.
    Published 1986
    Government Document Book
  2. 2
    Major indicator shrubs and herbs on national forests of eastern Oregon /
    by Hopkins, William E.
    Published 1985
    Government Document Book
  3. 3
    Major indicator shrubs and herbs on national forests of eastern Washington /
    by Williams, Clinton K.
    Published 1987
    Government Document Book
  4. 4
    Major indicator shrubs and herbs in riparian zones on national forests of central Oregon /
    by Kovalchik, Bernard L.
    Published 1988
    Government Document Book
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