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Google圖書搜尋
Corn Stalks Vs. Field Plots as a Guide to the Fertility Requirements of the Corn Crop
Frank Aldis Welton
Vincent Harmon Morris
Robert Wallace Gerdel
出版
Ohio Agricultural Experiment Station
, 1926
URL
http://books.google.com.hk/books?id=VE40zgEACAAJ&hl=&source=gbs_api