1902. 2011-05-24T19:37:16Z. 2015-10-21T14:59:53Z. U.S. Geological Survey. English. Public. Ashe County (N.C.), Caldwell County (N.C.), Carter County (Tenn.), Johnson County (Tenn.), Mitchell County (N.C.), North Carolina, Sullivan County (Tenn.), Tennessee, Watauga County (N.C.), and Wilkes County (N.C.).
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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.).
