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Forest stand losses to gypsy moth in the Poconos

David A. GansnerOwen W. Herrick

出版	Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1979
URL	http://books.google.com.hk/books?id=i0pOGw8gKWMC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN