| 000 | nam a22 7a 4500 | ||
|---|---|---|---|
| 999 |
_c4128 _d4128 |
||
| 003 | Biblioteca-INTEMIN | ||
| 005 | 20180606195444.0 | ||
| 008 | 180606b xxu||||| |||| 00| 0 eng d | ||
| 080 | _a622.807 | ||
| 100 |
_aArmstrong, F.E. _98225 |
||
| 245 |
_aTests for analysing the incombustible content of coal mine dust using instruments employing a gamma ray backscatter technique (BM-TPR 64) _cArmstrong, F.E. |
||
| 260 |
_aWashington _bBureau of mines _c1973 |
||
| 650 |
_aPOLVO EN LA MINA _98357 |
||
| 650 |
_aCONTROL DE POLVO EN LA MINA _98026 |
||
| 650 |
_aMINAS DE CARBON _95740 |
||
| 942 | _cBK | ||