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Map of the Mercer Clay and adjacent units in Clearfield, Centre, and Clinton Counties, Pennsylvania
- "Mercer clay and adjacent units in Clearfield, Centre, and Clinton Counties, Pennsylvania"
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- "Map of the Mercer Clay and adjacent units in Clearfield, Centre, and Clinton Counties, Pennsylvania"@en
- "Map of the Mercer clay and adjacent units in Clearfield, Centre, and Clinton Counties, Pennsylvania"