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The National Cooperative Soil Survey of the United States

David Rice GardnerUnited States. Natural Resources Conservation Service. Resource Economics and Social Sciences Division

出版	U.S. Department of Agriculture, Natural Resources Conservation Service, Resource Economics and Social Sciences Division, 1998
URL	http://books.google.com.hk/books?id=Nf7aRLidGoAC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN