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Google圖書搜尋
Woody plants selected by beavers in the Appalachian Ridge and Valley Province
Hewlette S. Crawford
Richard F. Harlow
S. R. G. Hooper
出版
U.S. Department of Agriculture, Forest Service, Notheastern Forest Experiment Station
, 1976
URL
http://books.google.com.hk/books?id=jBojzgEACAAJ&hl=&source=gbs_api