Publisher's Synopsis
Excerpt from Reports of the Inspectors of Mines of the Anthracite Coal Regions of Pennsylvania, for the Year 1874
Faults in these rocks, although invisible, as well as in the coal seam, are subject to the force and action of escaping gases, and may for a time escape the most experienced person, when it may suddenly be detached hythe force of escaping gases, and to the miner who trusted to its apparent safety may become the very instrument of his destruction.
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