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Precautions to be taken when approaching old mine workings

Published Year

• 1940-1949 (1)

Subject

• Abandoned mines--United States (1) *
• Mine safety--United States (1)
• Mines and mineral resources--United States--Safety measures (1)

Author

• Harrington, D. (1)
• Warncke, R. G. (1) *

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