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Bulletin

Charles Franklin NollJohn Robert EyerJonathan Winbourne WhiteM. F. GrimesPennsylvania State College. Agricultural Experiment StationRichard Chambers WaltonStuart Ward FrostWalter Spurgeon BeachWilliam Henry Tomhave

出版	Pennsylvania State College Agricultural Experiment Station, 1920
URL	http://books.google.com.hk/books?id=Ql9RAQAAMAAJ&hl=&source=gbs_api