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Soil Survey of Morgan County, Indiana

Herbert Paul UlrichT. E. BarnesArthur P. BellSutton MyersL. E. AllisonT. E. NivisonP. T. VealeA. T. Wiancko

出版	U.S. Department of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils, and Agricultural Engineering, 1950
URL	http://books.google.com.hk/books?id=2b4NkAPhQEIC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN