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