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Google圖書搜尋
Cropping Systems For Wheat Production
John Henry Shepperd
North Dakota Agricultural Experiment Station (Fargo)
R. C. Doneghue
出版
North Dakota Agricultural College, Government Agricultural Experiment Station for North Dakota
, 1912
URL
http://books.google.com.hk/books?id=d5EHcgAACAAJ&hl=&source=gbs_api