Berkshire's purchase of BNSF: inadequate review or sloppy due diligence?
págs. 20-21
To haul and back: Marathon performance in Canadian coal mine
págs. 22-23
págs. 24-27
págs. 28-51
Mining the Sewickley coal seam: a study in mine ground control
págs. 38-41
págs. 42-45
págs. 46-49
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