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A Comparison of Annual Cropping, Biennial Cropping, and Green Manures on the Yield of Wheat

Albert SchneiderArthur Howard HendricksonPaul Llewellyn HibbardBen Adolph MadsonEdwin Coblentz VoorhiesFritz Wilhelm WollPatrick Beveridge KennedyRalph Denny RobertsonRobert W. HodgsonWalter Wallace Weir

出版	Agricultural Experiment Station, 1916
URL	http://books.google.com.hk/books?id=f9VQAQAAMAAJ&hl=&source=gbs_api