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

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049	⊔	⊔	‡aBMRA
086	0	⊔	‡aC 22.12:3220
110	1	⊔	‡aUnited States. ‡bBureau of Mines.
245	0	0	‡aActive list of permissible explosives and blasting devices approved prior to June 30, 1933.
260	⊔	⊔	‡a[Washington, D.C.] : ‡bU.S. Dept. of Commerce, Bureau of Mines, ‡c1933.
300	⊔	⊔	‡a16 p. ; ‡c27 cm.
490	0	⊔	‡aReport of investigations / United States Department of Commerce, Bureau of Mines ; ‡v3220
500	⊔	⊔	‡aChiefly tables.
538	⊔	⊔	‡aMode of access: Internet.
650	⊔	0	‡aCoal mines and mining ‡xSafety measures.
650	⊔	0	‡aExplosives.
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