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Aspen

Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)

其他書名	Ecology and Management in the Western United States
出版	U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1985
URL	http://books.google.com.hk/books?id=nxhY0AEACAAJ&hl=&source=gbs_api