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Soil survey

United States Bureau of Chemistry and SoilsUnited States. Bureau of Plant IndustryUnited States. Bureau of Plant Industry, Soils, and Agricultural EngineeringUnited States. Soil Conservation ServiceUnited States. Natural Resources Conservation Service

出版	U.S. Dept. of Agriculture, 1980
主題	Soil surveysSoils
URL	http://books.google.com.hk/books?id=iPXwAAAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN