State Mining Laws on the Use of Electricity in and About Coal Mines (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from State Mining Laws on the Use of Electricity in and About Coal Mines

Coal mining is more widely distributed throughout the United States than is generally known, as 30 States are credited with having coal mines. In 1919 twenty-three of these States each produced at least a million tons Of bituminous coal, and all the States produced about tons. In addition, Pennsylvania produced about tons Of anthracite.

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