| 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 | ||