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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.
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Published Year
1930-1939 (2) *
Subject
Blasting--United States (2) *
Coal mines and mining--Explosives (2)
Explosives--United States (2)
