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Permissible explosives, mining equipment and apparatus approved prior to January 1, 1923

Published Year

• 1920-1929 (1)

Subject

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

Author

• Fieldner, Arno Carl, (1)
• Howell, Spencer P. (1)
• Ilsley, Lee C. (1) *
• Parker, Dorsey J. (1)

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