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Soil Survey of Boone County, Iowa

Wells F. AndrewsRobert O. Dideriksen

出版	U.S. Department of Agriculture, Soil Conservation Service, 1981
URL	http://books.google.com.hk/books?id=vdcAjmJbp4oC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN