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Effect of Time, Depth, and Method of Plowing Upon Yield and Eradication of Biennial Sweet Clovers
F. Scott Wilkins
Edgar Vermont Collins
Iowa Agricultural Experiment Station
出版
Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts
, 1933
URL
http://books.google.com.hk/books?id=CHckAQAAMAAJ&hl=&source=gbs_api