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Soil Survey, Garfield County, Oklahoma

Elmer Grant FitzpatrickWilliam Carl BoatrightL. E. Rose

出版	U.S. Department of Agriculture, Agricultural Research Administration, Bureau of Chemistry and Soils, 1939
URL	http://books.google.com.hk/books?id=eJ9RchU1vR8C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN