Search U.S. government technical reports digitized or harvested by TRAIL.
Permissible explosives :tested prior to January 1, 1917
Permissible explosives, mining equipment, and apparatus, approved prior to March 15, 1922
Permissible explosives, mining equipment and apparatus approved prior to January 1, 1923
Permissible explosives, mining equipment, and apparatus approved prior to January 1, 1925
Official 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
List of permissible mine equipment approved to January 1, 1940
List of permissible mine equipment approved to January 1, 1942
Hazards of black blasting powder in underground coal mining
Active list of permissible explosives and blasting devices approved before December 31, 1957