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Google圖書搜尋
A Suggested Method for Rating the Vulnerability of Spruce-fir Stands to Budworm Attack
Marinus Westveld
出版
U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station
, 1945
URL
http://books.google.com.hk/books?id=T5nZuQEACAAJ&hl=&source=gbs_api