| 000 | 00845cab a2200313 4500 | ||
|---|---|---|---|
| 001 | ABS50173 | ||
| 008 | 090401t1994 xxu||||| |||| 00| 0 eng d | ||
| 035 | _a(Sirsi) u74489 | ||
| 041 | _aeng | ||
| 100 | _aRussell, H. | ||
| 245 | _aEcho chamber | ||
| 260 | _c1994 | ||
| 350 | _a0 | ||
| 490 |
_aNew Civil Engineer _v(1071) 27 January 1994, 31-32(2) |
||
| 520 | _aExplains how underground surveying specialist, Geosonde, investigate flooded mines with sonar equipment. | ||
| 650 | _aABANDONED MINE WORKINGS | ||
| 650 | _aDISUSED LIMESTONE MINES | ||
| 650 | _aFLOODED MINES | ||
| 650 | _aGEOSONDE | ||
| 650 | _aLASERS | ||
| 650 | _aMINE PLANS | ||
| 650 | _aMINES | ||
| 650 | _aMONITORING | ||
| 650 | _aSONAR EQUIPMENT | ||
| 650 | _aSONAR SURVEYING | ||
| 690 | _aMINING AND MINERALS | ||
| 942 | _n0 | ||
| 948 | _c04/03/1997 | ||
| 999 |
_c46974 _d46974 |
||