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Google圖書搜尋
Farm Practice in Growing Sugar Beets in Three California Districts
Thomas Henry Summers
出版
U.S. Government Printing Office
, 1919
URL
http://books.google.com.hk/books?id=XbPYAQAACAAJ&hl=&source=gbs_api
註釋
Of results -- Method of investigation. pp. 3.