Thuro, K. <br/><br/>
Drillability prediction: geological influences in hard rock drill and blast tunnelling 

 - Berlin  Springer Verlag  August 1997 
 - pp. 426-438  ilus. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PERFORACION<br/>PERFORADORAS<br/>TUNELES