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New Research: A selection methodology on reasonable width of stabilized coal pillar for retracement channel in longwall working face https://t.co/VTn3McaQI0 #FrontiersIn #EarthScience
New Research: A selection methodology on reasonable width of stabilized coal pillar for retracement channel in longwall working face https://t.co/VTn3McaQI0 #FrontiersIn #EarthScience