1891. 2011-06-01T13:27:01Z. 2015-10-21T15:00:10Z. U.S. Geological Survey. English. Public. Ashe County (N.C.), Grayson County (Va.), Johnson County (Tenn.), North Carolina, Russell County (Va.), Smyth County (Va.), Sullivan County (Tenn.), Tazewell County (Va.), Tennessee, Virginia, and Washington 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.).
1911. 2011-05-27T19:39:08Z. 2015-10-21T15:00:04Z. Geological Survey (U.S.). The Survey. English. Public. Abingdon Region (Va.), North Carolina, Russell County (Va.), Smyth County (Va.), Tennessee, Virginia, and Washington County (Va.).