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Bulletin

Charles Aubrey ThomasHarold James MillerJ. G. HawthorneJ. K. SternMacklin Elida JohnPercival Thomas ZieglerStephen GordeukTheodore C. ScheifeleWalter Spurgeon BeachWilliam Green Mather

出版	Pennsylvania State College, School of Agriculture, Agricultural Experiment Station, 1948
URL	http://books.google.com.hk/books?id=UWNRAQAAMAAJ&hl=&source=gbs_api