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Forest Growth and Sheep Grazing in the Cascade Mountains of Oregon

A. L. JohnsonCharles Theodore MohrFrederick Vernon CovilleGeorge B. Sudworth

出版	Department of Agriculture, Forestry Division, 1895
URL	http://books.google.com.hk/books?id=pfpRAQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN