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Bulletin

Carroll Eugene HeistClarence Earl TrotterGlenn Otto BresslerLennie G. KizerPaul Charles KersavagePennsylvania State University. Agricultural Experiment StationTheodore E. FullerWayne K. Murphey

出版	Pennsylvania State University, College of Agriculture, Agricultural Experiment Station, 1971
URL	http://books.google.com.hk/books?id=BtRPAQAAMAAJ&hl=&source=gbs_api