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Active list of permissible explosives and blasting devices approved before July 1, 1970

Active list of permissible explosives and blasting devices approved before December 31, 1972 :supercedes Information Circular 8493

Published Year

• 1970-1979 (2) *

Subject

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

Author

• Mason, C. M. (1)
• Ribovich, John. (1)
• Richardson, P. A. (1)
• Watson, Richard W. (1)

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