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Western Spruce Budworm in Eastern Oregon, 1980

Tim McConnellPaul JosephDavid McCombDaniel B. Twardus

出版	U.S. Department of Agriculture, Forest Serivce, Pacific Northwest Region, 1980
URL	http://books.google.com.hk/books?id=sO-OAQAACAAJ&hl=&source=gbs_api