1974. 2012-04-26T19:27:48Z. 2012-05-03T15:42:12Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Pike County, and Letcher County.
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1971. 2012-03-13T14:07:19Z. 2012-03-27T23:58:50Z. Alvord, Donald C. (Donald Clayton), 1922-. The Survey. English. Public. Pennsylvania, Pike County, Monroe County, New Jersey, and Warren County.
1972. 2012-03-16T15:08:45Z. 2016-10-11T21:06:59Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Pike County, Virginia, Buchanan County, and Dickenson County.
1971. 2012-03-16T14:53:44Z. 2012-03-27T23:59:41Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Pike County, and Virginia.
1969. 2012-01-31T18:18:35Z. 2012-03-05T17:37:53Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky and Pike County.
1965. 2011-12-06T21:25:02Z. 2012-03-05T17:20:18Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Pike County, and U.S.