000 | nam a22 7a 4500 | ||
---|---|---|---|
999 |
_c2666 _d2666 |
||
003 | Biblioteca-INTEMIN | ||
005 | 20180521192005.0 | ||
008 | 180521b xxu||||| |||| 00| 0 eng d | ||
080 | _a622.47 | ||
100 |
_aJohnson, Guy A. _96286 |
||
245 |
_aFresnel lens blind area viewers for improvised mine equipment safety and productivity _cJohnson, Guy A. |
||
260 |
_aWashington _bBureau of mines _c1983 |
||
650 |
_aMINERIA _965 |
||
650 |
_aILUMINACION DE MINAS _95312 |
||
942 | _cBK |