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Bulletin

Clarence Scott AndersonDavid H. WalterErnest Browning ForbesErnest William CallenbachHarlan Noyes WorthleyJohn Edward NicholasNelson ShaulisPennsylvania State College. Agricultural Experiment StationWilliam R. Whitacre

出版	Pennsylvania State College, School of Agriculture and Experiment Station, 1938
URL	http://books.google.com.hk/books?id=u89PAQAAMAAJ&hl=&source=gbs_api