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Google圖書搜尋
Studies on Nitrification and Its Relation to Crop Production on Carrington Loam Under Different Treatments
Lewis Wilson Erdman
出版
Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts
, 1928
URL
http://books.google.com.hk/books?id=038kAQAAMAAJ&hl=&source=gbs_api