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How to Distinguish Between Old and New Egg Masses of the Western Spruce Budworm
D. B. Twardus
Daniel B. Twardus
V. M. Carolin
United States. Forest Service
出版
U.S. Forest Service
, 1984
URL
http://books.google.com.hk/books?id=5XRiygAACAAJ&hl=&source=gbs_api