Bieniawski, Z.T. <br/><br/>
Engineering rock mass classifications  a complete manual for engineers and geologists in mining, civil, and petroleum engineering 

 - New York  John Wiley  1989 
 - xii, 251 p. 
<br/><br/><label>ISBN: </label>0471601721 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CIVIL ENGINEERING<br/>ENGINEERING GEOLOGY<br/>ROCK DRILLING<br/>ROCK DRILLING
<br/><br/><label>Universal Decimal Class. No.: </label>624.12  / BIE