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Meeting Agriculture's Old and New Problems with the Aid of Science
Benjamin Horace Hibbard
David R. Mitchell
Earl Frederick Buck
Edwin Bret Hart
George Simon Wehrwein
Gustav Bohstedt
John Charles Walker
University of Wisconsin. Agricultural Experiment Station
其他書名
Annual Report of the Director, 1930-1931
出版
Agricultural Experiment Station, University of Wisconsin
, 1932
URL
http://books.google.com.hk/books?id=k3NRAQAAMAAJ&hl=&source=gbs_api