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Sampling Low Density Populations of the Douglas-fir Tussock Moth by Frequency of Occurrence in the Lower Tree Crown

Richard R. Mason

出版	Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1977
URL	http://books.google.com.hk/books?id=syojDhavVacC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN