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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2. Geologic map of the Orwigsburg quadrangle, Schuylkill County, Pennsylvania [cartographic material]
1973. 2012-03-28T20:09:51Z. 2012-05-03T15:33:55Z. Wood, Gordon H. (Gordon Harry), 1919-. The Survey. English. Public. Pennsylvania and Schuylkill County.
