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Modified Longwall Mining with a German Coal Planer (plow) in the Pocohontas No. 4 Coal Bed, Helen, W. Va

Modified Longwall Mining with a German Coal Planer (plow) in the Pocohontas No. 4 Coal Bed, Helen, W. Va

James J. Dowd, Wilbur A. Haley, Louis A. Turnbull — 1952

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