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Charles Aubrey ThomasChester Distad DahleFrederick Fouse LiningerFrederick Grover MerkleHarlan Noyes WorthleyMartin William LissePennsylvania State College. Agricultural Experiment StationRaymond Adams DutcherWalter Spurgeon Beach

出版	Pennsylvania State College, School of Agriculture and Experiment Station, 1931
URL	http://books.google.com.hk/books?id=m2JRAQAAMAAJ&hl=&source=gbs_api