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

Year: 1933
Document Type: BMRA
Issuing Agency: U.S. Dept. of Commerce, Bureau of Mines,
SUDOC: C 22.12:3220
Series: Report of investigations / United States Department of Commerce, Bureau of Mines ;
Report Number: 3220
Subjects: Coal mines and mining--Safety measures
Explosives
Link: https://hdl.handle.net/2027/mdp.39015077563255

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