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Soil Survey, Sherman County, Oregon

Elbert L. BellLeo R. MayersThomas E. BeesleyHoward Eugene SautterRichard K. Jackson

出版	U.S. Department of Agriculture, Soil Conservation Service, 1964
URL	http://books.google.com.hk/books?id=9EVVzgEACAAJ&hl=&source=gbs_api