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Permissible explosives, mining equipment, and apparatus, approved prior to March 15, 1922

Published Year

• 1920-1929 (1) *

Subject

• Coal mines and mining--Safety measures (1)
• Explosives (1)

Author

• Fieldner, A. C. (1)
• Howell, S. P. (1)
• Ilsley, L. C. (1)
• Parker, D. J. (1) *

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