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Soil Survey, Washington County, Virginia
Robert Campbell Jurney
Samuel Shockley Obenshain
Edward Shulkcum
出版
United States Department of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils, and Agricultural Engineering
, 1945
URL
http://books.google.com.hk/books?id=BtipvAEACAAJ&hl=&source=gbs_api