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Google圖書搜尋
A Ten-year Study of the Effect of Fertilizers on the Soluble Plant Food in the Soils and on the Crop Yield
Walter Beal Ellett
Henry Harris Hill
出版
Virginia Agricultural Experiment Station
, 1917
URL
http://books.google.com.hk/books?id=PzMrAQAAMAAJ&hl=&source=gbs_api
