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

 - New York  Wiley-Interscience, John Wiley and Sons  1989 
 - xii, 251p. ; 24 cm. 
<br/><br/><label>ISBN: </label>9780471601722  0471601721  
<br/><br/><label>Subjects--Index Terms: </label>Civil engineering  Geology Economics Rocks-classification Rock-mechanics 
<br/><br/><label>Dewey Class. No.: </label>624.15132  / BIE