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Longwall mining methods in some mines of the Middle Western states

Modified longwall mining with a German coal planer (plow) in the Pocohontas No. 4 coal bed, Helen, W. Va.

Mining with a Dosco continuous miner on a longwall face

Modified longwall mining with a German coal planer.

Modified longwall mining with German coal planers :summary of operations at five coal mines

Longwall mining in bituminous coal mines with planers, shearer- loaders, and self-advancing hydraulic roof supports


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