| 000 | 00407nam a2200121Ia 4500 | ||
|---|---|---|---|
| 008 | 190711s9999 xx 000 0 und d | ||
| 082 | _a622.26 U58 | ||
| 100 | _aUNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF MINES | ||
| 245 | 0 | _aIMPROVING THE PERFORMANCE OF TUNNEL RAISE AND SHAFT BORING MACHINES FOR COAL MIN | |
| 260 |
_aSPRINGFIELD _bU.S.DEPT.OF INTERIOR _c1986 |
||
| 300 | _a29X23 | ||
| 942 |
_cBK _2DDC |
||
| 999 |
_c21975 _d21975 |
||