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Active list of permissible explosives and devices approved previous to June 30, 1943
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Published Year
1940-1949 (1)
Subject
Blasting--United States (1)
Coal mines and mining--Explosives (1) *
Explosives--United States (1)
Author
Gaugler, Z. C. (1) *
Tiffany, J. E. (1)
