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The Pennsylvania Agricultural Experiment Station 39th Annual Report of the Director

Charles Franklin NollEdgar George RexErnest Leland NixonSamuel Irvin BechdelWalter Spurgeon BeachP. T. KistlerPennsylvania State College. Agricultural Experiment StationStuart Ward Frost

出版	Pennsylvania State College Agricultural Experiment Station, 1925
URL	http://books.google.com.hk/books?id=-8lPAQAAMAAJ&hl=&source=gbs_api