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  1. 1
    by Orr-Ewing, A. L.
    Published 1972
    “...British Columbia Forest Service. Research Division,...”
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    Interracial crosses with Douglas fir; early field results /
  2. 2
    Published 1978
    “...Ministry of Forests, Information Service Branch,...”
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    Proceedings of the IUFRO joint meeting of working parties : Vancouver, Canada, 1978 : S2-02-05 Douglas fir provenances, S2-02-06 Lodgepole pine provenances, S2-02-12 Sitka spruce provenances, S2-02-14 Abies provenances.

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