1892. 2011-05-23T20:06:43Z. 2015-10-21T14:59:48Z. Geological Survey (U.S.). U.S. Dept. of the Interior, Geological Survey. English. Public. Dickenson County (Va.), Floyd (Ky.), Kentucky, Knott (Ky.), Letcher (Ky.), Pike County (Ky.), Virginia, and Wise County (Va.).
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1892. 2011-05-31T13:33:49Z. 2015-10-21T15:00:05Z. Geological Survey (U.S.). The Survey. English. Public. Buchanan County (Va.), Dickenson County (Va.), Grundy (Va.), Grundy Region (Va.), Kentucky, Russell County (Va.), and Wise County (Va.).
1902. 2011-05-27T19:45:54Z. 2015-10-21T15:00:04Z. Geological Survey (U.S.). The Survey. English. Public. Bristol (Va.), Bristol Region (Va.), Russell County (Va.), Scott County (Va.), Tennessee, Virginia, Washington County (Va.), and Wise County (Va.).