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Soil Survey

D. C. HallbickDonald L. WallaceE. G. HolhubnerJohn E. PaschkeUniversity of Illinois (Urbana-Champaign campus). Agricultural Experiment Station

其他書名	Gallatin County, Illinois
出版	U.S. Soil Conservation Service, 1971
URL	http://books.google.com.hk/books?id=7w1QAQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN