1971. 2012-03-13T14:07:19Z. 2012-03-27T23:58:50Z. Alvord, Donald C. (Donald Clayton), 1922-. The Survey. English. Public. Pennsylvania, Pike County, Monroe County, New Jersey, and Warren County.
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1971. 2012-03-16T14:53:44Z. 2012-03-27T23:59:41Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Pike County, and Virginia.