000			nam a22 7a 4500
999			_c4182 _d4182
003			Biblioteca-INTEMIN
005			20180607182923.0
008			180607b xxu||||| |||| 00| 0 eng d
080			_a622.4
100			_aVolkwein, Jon C. _92402
245			_aDust protection afforded by enclosed cabs on surface and underground mine machinery (BM-TPR 109) _cVolkwein, Jon C.
260			_aWashington _bBureau of mines _c1979
650			_aVENTILACION EN LAS MINAS _96594
650			_aMAQUINAS Y HERRAMIENTAS _95715
942			_cBK