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2. Geologic factors in coal mine roof stability: a progress report;Noel;Bureau Mines,1984
3. Selected geologic factors affecting mining of the Pittsburgh coalbed;McCulloch;Bureau Mines,1975
4. Impact of a massive sandstone channel on a 1500-foot (457 m) wide longwall face-mitigation and evaluation;Su,2012
5. Influence of structural stress concentration and structural irregularity on longwall gateroad roof control;Su,2002