| 000 | nam a22 7a 4500 | ||
|---|---|---|---|
| 999 |
_c3795 _d3795 |
||
| 003 | Biblioteca-INTEMIN | ||
| 005 | 20180531123826.0 | ||
| 008 | 180531b xxu||||| |||| 00| 0 eng d | ||
| 080 | _a622.03 | ||
| 100 |
_aStahl, Robert Lee _97717 |
||
| 245 |
_aGuide to geologic features affecting coal mine roof _cStahl, Robert Lee |
||
| 260 |
_aWashington _bDepartment of Labor _c1979 |
||
| 650 |
_aMINERIA _965 |
||
| 650 |
_aCARACTERISTICAS GEOLOGICAS _95677 |
||
| 942 | _cBK | ||