000 nam a22 7a 4500
999 _c3329
_d3329
003 Biblioteca INTEMIN
005 20180528174416.0
007 Publicación seriada
008 180528b xxu||||| |||| 00| 0 eng d
041 _aInglés
080 _a622.23.051:536.7 (47)
100 _aBruce, William E.
_97377
245 _aEnergetics of percussive drills
_cBruce, William E.
260 _aWashington
_bBureau of mines
_c1969
490 _aReport Investigation
_v7253
650 _aenergética
_97378
650 _abroca percutora
_97379
942 _2udc
_cCR