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Outbreaks of the Western Spruce Budworm in the American Northern Rocky Mountain Area from 1922 Through 1971
Philip Cornwell JohnsonRobert E. Denton
出版Intermountain Forest & Range Experiment Station, Forest Service, U.S. Department of Agriculture, 1975
URLhttp://books.google.com.hk/books?id=hPI4MYV0lV8C&hl=&source=gbs_api
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