1891. 2011-05-23T19:47:53Z. 2016-06-03T19:24:08Z. Geological Survey (U.S.). U.S. Dept. of the Interior, Geological Survey. English. Public. Breathitt County (Ky.), Kentucky, Knott County (Ky.), Leslie County (Ky.), Letcher County (Ky.), and Perry County (Ky.).
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1890. 2011-05-23T19:50:32Z. 2015-10-21T14:59:48Z. Geological Survey (U.S.). U.S. Dept. of the Interior, Geological Survey. English. Public. Claiborn County (Tenn.), Hancock County (Tenn.), Harlan County (Ky.), Kentucky, Lee County (Va.), Leslie County (Ky.), Tennessee, and Virginia.
1889. 2011-05-23T20:09:22Z. 2015-10-21T14:59:48Z. Geological Survey (U.S.). U.S. Dept. of the Interior, Geological Survey. English. Public. Campbell County (Tenn.), Kentucky, Knox (Ky.), Laurel (Ky.), Pulaski (Ky.), Scott County (Tenn.), Tennessee, and Whitley (Ky.).
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.).
1891. 2011-05-23T19:40:24Z. 2015-10-21T14:59:47Z. Geological Survey (U.S.). U.S. Dept. of the Interior, Geological Survey. English. Public. Bell County (Ky.), Claiborne County (Tenn.), Clay County (Ky.), Kentucky, Knox County (Ky.), Lee County (Va.), Leslie County (Ky.), Tennessee, Virginia, and Whitley County (Ky.).