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Cooling a Douglas-fir Seed Orchard to Avoid Pollen Contamination
Roy R. SilenGene Keane
出版Pacific Northwest Forest and Range Experiment Station, U.S.D.A. Forest Service, 1969
URLhttp://books.google.com.hk/books?id=igEKp3D_ht0C&hl=&source=gbs_api
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