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Degree-day Accumulation Related to the Phenology of Douglas-fir Tussock Moth and White Fir During Five Seasons of Monitoring in Southern Oregon

出版	U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1981
URL	http://books.google.com.hk/books?id=osrwMjn1la8C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN