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Bulletin

Clarence Scott AndersonHoward William HigbeeJ. W. SindenJoseph Timothy SullivanP. H. MargolfPennsylvania State College. Agricultural Experiment StationRalph John GarberRalph Levi WattsWendell Edgar Keepper

出版	Pennsylvania State College, School of Agriculture, Agricultural Experiment Station, 1946
URL	http://books.google.com.hk/books?id=BWZRAQAAMAAJ&hl=&source=gbs_api