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Sampling Populations of Western Spruce Budworm and Predicting Defoliation on Douglas-fir in Eastern Oregon
Valentine M. CarolinW. K. Coulter
出版Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, Forest Service, 1972
URLhttp://books.google.com.hk/books?id=kGk-fZ1uIAoC&hl=&source=gbs_api
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