164 resultados para Coal mines


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Part V of the report of the Department of Internal Affairs

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"Appointed to inquire into the causes of the present dearness and scarcity of coal."

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Item 429-T-11

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Mode of access: Internet.

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"Specially compiled and prepared for the convenient use of mine officials, mining engineers, and students preparing themselves for certificates of competency as mine inspectors or mine foremen."

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1 folded map in pocket.

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"Report of the United States Bureau of Mines to the Pennsylvania State Anthracite Mine Cave Commission and review of the compressive strength of anthracite, bituminous coals and mine supports."

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Prepared for Office of Coal Research, U.S. Department of the Interior.