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Google圖書搜尋
Graded Trails as an Aid in the Distribution of Cattle on Rough Ranges
B. A. Hendricks
出版
USDA Forest Service, Southwestern Forest and Range Experiment Station
, 1939
URL
http://books.google.com.hk/books?id=tXvNtgAACAAJ&hl=&source=gbs_api