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  • A pioneer exotic tree search for the douglas fir region

    Creator:
    Silen, Roy R. and Olson, Donald L.
    Abstract:
    After three-quarters of a century of introduction of 152 conifer and broadleaf species, no promising candidate exotic was found for the Douglas-fir region. Growth curves spanning 50 years or longer are figured for many species. Firs, pines, larches, spruces, hemlocks, and cedars originating in northwestern North America had superior growth...
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