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Google圖書搜尋
Farm Practice in Growing Field Crops in Three Sugar-beet Districts of Colorado
Samuel Benton Nuckols
Thomas Henry Summers
出版
U.S. Department of Agriculture
, 1921
URL
http://books.google.com.hk/books?id=U5I0zgEACAAJ&hl=&source=gbs_api
註釋
Pp. 51.