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Google圖書搜尋
The Length of the Growing Season in North Dakota
Edwin Fremont Ladd
Albert Moore Ten Eyck
John Henry Shepperd
出版
North Dakota Agricultural College, Government Agricultural Experiment Station for North Dakota
, 1902
URL
http://books.google.com.hk/books?id=BT4nAQAAMAAJ&hl=&source=gbs_api