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1965. 2011-12-16T20:00:49Z. 2021-10-01T21:32:56Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Perry County, Knott County, and Letcher County.
3. Principal coal beds in the Troublesome quadrangle, Breathitt, Knott, and Perry Counties, Kentucky
1953. 2018-06-21T19:42:46Z. 2018-06-21T19:42:46Z. Williamson, A. D. The Survey. English. cartographic image. Public. Kentucky, Knott County, Breathitt County, Perry County, Breathitt County., Knott County., and Perry County.