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Soil Survey, Washington County, Virginia

Robert Campbell JurneySamuel Shockley ObenshainEdward Shulkcum

出版	U.S. Department of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils, and Agricultural Engineering, 1945
URL	http://books.google.com.hk/books?id=tcqk7GWKvQcC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN