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Ripening and Dispersal of a Bumper Western Hemlock-Sitka Spruce Seed Crop in Southeast Alaska

A. S. Harris

出版	Pacific Northwest Forest and Range Experiment Station, U.S. Forest Service, 1969
URL	http://books.google.com.hk/books?id=fMcbb9xJn38C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN