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1990. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Pennsylvania and Chester County.
1982. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Oklahoma.
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1981. 2002-06-01T04:00:00Z. 2023-01-11T04:01:22Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. High Plains (U.S.) and Kansas.
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