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Soil Survey of Dubois County, Indiana

Charles Shaffer SimmonsJames Edward AdamsThomas Mark BushnellRichard Thomas Avon BurkeHerbert Paul Ulrich

出版	U.S. Government Printing Office, 1937
URL	http://books.google.com.hk/books?id=bPq9iobSHk0C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN