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Research Paper PNW.

C. G. ThompsonD. Calvin McCluskeyDonald E. HiltK. W. SeidelKent B. DowningMauro E MartignoniPaul E. AhoRobert W. SassamanE. Charles Meslow

出版	Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1977
URL	http://books.google.com.hk/books?id=ZrGm5cfRGTEC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN