Correlation chart of Pennsylvanian rocks in Alabama, Tennessee, Kentucky, Virginia, West Virginia, Ohio, Maryland, and Pennsylvania showing approximate position of coal beds, coal zones, and key stratigraphic units
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| Description | scholarly article published 2014 |
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author: Leslie F. Ruppert Michael H. Trippi |
| Publication date | 2014 |
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| Missing/wrong data? | Edit Wikidata item |