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Bulletin

Austin Lathrop PatrickFrederick Fouse LiningerJames Johnston ReidJohn Arden FergusonPennsylvania State College. Agricultural Experiment StationPercival Thomas ZieglerThew Delbert JohnsonThomas Byron KeithWalter Spurgeon Beach

出版	Pennsylvania State College, School of Agriculture and Experiment Station, 1937
URL	http://books.google.com.hk/books?id=ZGJRAQAAMAAJ&hl=&source=gbs_api