1972. 2012-03-20T13:35:01Z. 2012-05-03T15:29:07Z. Geological Survey (U.S.). The Survey. English. Public. Washington (State), Jefferson County, Mason County, and Kitsap County.
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1971. 2012-03-12T12:52:59Z. 2012-03-27T23:58:25Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Fleming County, and Mason County.
1971. 2012-03-20T15:08:00Z. 2012-05-03T15:29:31Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Mason County, and Bracken County.
1967. 2012-01-17T20:10:25Z. 2012-03-05T17:34:04Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Kentucky, Mason County, Fleming County, and Lewis County.