Official changes in the active list of permissible explosives and blasting devices approved prior to January 31, 1933 / by the Bureau of Mines.
|Corporate Author:||United States.|
|Other Authors:||Turner, Scott.|
[Washington, D.C.?] : U.S. Dept. of Commerce, Bureau of Mines, 1933.
> Safety regulations
"R. I. 3202."
2 p. ;
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