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

Published Year

• 1970-1979 (1)

Subject

• Blasting (1)
• Coal mines and mining--Explosives (1) *
• Explosives--Law and legislation--United States (1)

Author

• Ribovich, John. (1)
• Watson, Richard W. (1) *

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