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Google圖書搜尋
Economic Considerations for Selecting the Superior Frequency of Fallow for Wheat in Three Locations in Western Kansas
Dale Alpheus Knight
出版
Agricultural Experiment Station, Kansas State College of Agriculture and Applied Science
, 1956
URL
http://books.google.com.hk/books?id=RGonAQAAMAAJ&hl=&source=gbs_api