Active list of permissible explosives and blasting devices approved prior to June 30, 1933.

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Corporate Author
United States. Bureau of Mines.
Language(s)
English
Published
[Washington, D.C.] : U.S. Dept. of Commerce, Bureau of Mines, 1933.
Subjects
Coal mines and mining > Safety measures.
Explosives.
Note
Chiefly tables.
Physical Description
16 p. ; 27 cm.
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