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Permissible explosives, mining equipment, and apparatus approved prior to January 1, 1925

Published Year

• 1920-1929 (1)

Subject

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

Author

• Crawshaw, John Edwards, (1)
• Fieldner, A.C. (1)
• Ilsley, L.C. (1)
• Parker, D.J. (1)
• Perrott, G. St. J. (1) *

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