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Google圖書搜尋
Crown Competition Factor (CCF) for Engelmann Spruce in the Central Rocky Mountains
Robert R. Alexander
出版
Forest Service, U.S. Department of Agriculture, Rocky Mountain Forest and Range Experiment Station
, 1971
URL
http://books.google.com.hk/books?id=jbMxdRqlpUoC&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN