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Google圖書搜尋
Relation of the Total Nitrogen of the Soil to Its Needs as Shown in Pot Experiments
Arthur Tillman Potts
George Stronach Fraps
James Burness Rather
Otto Olson
出版
Texas Agricultural Experiment Stations
, 1912
URL
http://books.google.com.hk/books?id=hSJRAQAAMAAJ&hl=&source=gbs_api