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Active list of permissible explosives and blasting devices approved prior to June 30, 1938

Active list of permissible explosives and blasting devices approved prior to June 30, 1939 / U.S. Dept. of the Interior, Bureau of Mines.

Published Year

• 1930-1939 (2) *

Subject

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

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