1973. 2012-04-03T14:18:08Z. 2012-05-03T15:36:05Z. Osborne, Robert H. Geological Survey. English. Public. Ohio, Clermont County, Brown County, Kentucky, and Bracken County.
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1973. 2012-04-03T14:23:41Z. 2012-05-03T15:36:08Z. Outerbridge, William F. Geological Survey. English. Public. Ohio and Kentucky.
1973. 2012-04-09T13:18:30Z. 2012-04-16T15:47:48Z. Kohut, Joseph J. Geological Survey. English. Public. Ohio, Clermont County, Kentucky, and Campbell County.