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Permissible Explosives, Mining Equipment, and Apparatus Approved Prior to January 1, 1924

Published Year

• 1920-1929 (1)

Subject

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

Author

• Crawshaw, John Edward, 1880- (1)
• Ilsley, L. C., 1880- (1)
• Parker, Dorsey J. (1) *

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