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Crop Rotation and Cultural Methods at the Akron (Colorado) Field Station in the 15-year Period from 1909 to 1923, Inclusive

Arthur Frederick SieversEdward Lawrence GriffinGeorge Walter MorganJohn Boyd GillJohn Walter TaylorJoseph Franklin BrandonRalph Henry ElsworthRay Sanford TowleRobert Macfarlane ChapinErnest Adna BackFrank Rabak

出版	U.S. Department of Agriculture, 1924
URL	http://books.google.com.hk/books?id=4D9iswEACAAJ&hl=&source=gbs_api