1993. 2002-06-01T04:00:00Z. 2012-07-16T18:05:44Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Pennsylvania, Lehigh County, and Berks County.
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1987. 2002-06-01T04:00:00Z. 2012-07-05T13:51:05Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Pennsylvania, Schuylkill County, and Berks County.
1985. 2002-06-01T04:00:00Z. 2012-07-05T13:09:36Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Pennsylvania, Berks County, Lehigh County, Berks County (Pa.), and Lehigh County (Pa.).
1968. 2012-01-24T16:11:35Z. 2012-03-05T17:35:38Z. Wood, Gordon H. (Gordon Harry), 1919-. Geological Survey. English. Public. Pennsylvania, Schuylkill County, Lebanon County, and Berks County.
1968. 2012-01-24T16:07:09Z. 2012-03-05T17:35:38Z. Wood, Gordon H. (Gordon Harry), 1919-. U.S. Geological Survey. English. Public. Pennsylvania, Schuylkill County, and Berks County.
1987. 2002-06-01T04:00:00Z. 2012-07-11T15:29:51Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Pennsylvania, Lehigh County, and Berks County.
