Browse TRAIL Inventories

Method and cost of mining the Pittsburgh, or no. 8, coal bed in a 100 percent mechanized mine in eastern Ohio

Method and cost of mining the Pittsburgh, or no. 8, coal bed in four eastern Ohio mines

Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio

Methods of development and pillar extraction in mining the Pittsburgh coal bed in Pennsylvania, West Virginia, and Ohio


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