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Active list of permissible explosives and blasting devices approved before Jan. 1, 1965

Active list of permissible explosives and blasting devices approved before December 1, 1967

Published Year

• 1960-1969 (2) *

Subject

• Coal mines and mining--Explosives (2)
• Explosives--Law and legislation--United States (2) *

Author

• Richardson, P. A. (2)
• Hanna, N. E. (1)
• Mason, C. M. (1)

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