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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

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

• 1960-1969 (2)
• 1970-1979 (2)

Subject

• Coal mines and mining--Explosives (4) *
• Explosives--Law and legislation--United States (4) *
• Blasting (2)

Author

• Richardson, P. A. (3)
• Mason, C. M. (2)
• Hanna, N. E. (1)
• Ribovich, John. (1)
• Watson, Richard W. (1)

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