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Soil Survey: Scotts Bluff County, Nebraska

Norman W. HuberRobert S. PollockUnited States. Soil Conservation ServiceRonald R. Hoppes

出版	U.S. Department of Agriculture, Soil Conservation Service, 1967
URL	http://books.google.com.hk/books?id=KcgpMQAACAAJ&hl=&source=gbs_api