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Search U.S. government technical reports digitized or harvested by TRAIL.
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8 results returnedOfficial changes in the active list of permissible explosives and blasting devices for August, 1931
Active list of permissible explosives and blasting devices approved prior to June 30. 1931.
Official changes in the active list of permissible explosives and blasting devices for October, 1931
Active list of permissible explosives and blasting devices approved prior to June 30, 1932
Active list of permissible explosives and blasting devices approved prior to June 30, 1933.
Active list of permissible explosives and blasting devices approved prior to July 31, 1936.
List of permissible mine equipment :approved to January 1, 1937
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