1975. 2012-05-02T15:04:17Z. 2012-05-09T14:05:37Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Knox County, and Whitley County.
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1975. 2012-05-03T13:28:45Z. 2012-05-09T14:06:12Z. Rice, Charles L. U.S. Geological Survey. English. Public. Kentucky and Whitley County.
