1973. 2012-03-30T15:34:39Z. 2012-05-03T15:34:42Z. Wood, Gordon H. (Gordon Harry), 1919-. Geological Survey. English. Public. Pennsylvania and Schuylkill County.
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1973. 2012-04-03T14:27:30Z. 2012-05-03T15:36:10Z. Roen, John B. Geological Survey. English. Public. Pennsylvania and Washington County.