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USGSdrill-hole data, in feet. GL—Ground level elevation R—Rock interval C—Coal interval NR-N0 Record TD-T0tal depth DRILL-HOLE DATA SYMBOLS *—Measured coal thickness ND—No

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Page 1: USGSdrill-hole data, in feet. GL—Ground level elevation R—Rock interval C—Coal interval NR-N0 Record TD-T0tal depth DRILL-HOLE DATA SYMBOLS *—Measured coal thickness ND—No