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Bulletin

Charles Emory MyersCharles Franklin NollChester Distad DahleE. M. FunkFrank Nelson FaganJ. K. SternMark Anthony McCartyPennsylvania State College. Agricultural Experiment StationRoland Willey BartlettRoy David AnthonyWilliam Lewis Henning

出版	Pennsylvania State College, School of Agriculture and Experiment Station, 1930
URL	http://books.google.com.hk/books?id=Y85PAQAAMAAJ&hl=&source=gbs_api