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10-Q
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CERTIFICATION OF DAVID CRANE
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CERTIFICATION OF KIRKLAND B. ANDREWS
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CERTIFICATION OF RONALD B. STARK
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SECTION 1350 CERTIFICATION
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MINE SAFETY DISCLOSURES
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XBRL INSTANCE DOCUMENT
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XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
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XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
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XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
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XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
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XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
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