Obert, Leonard, <br/><br/>
Rock mechanics and the design of structures in rock 
[by] Leonard Obert [and] Wilbur I. Duvall. 
 - New York,  Wiley  [1967] 
 - xix, 650 p.  illus.  24 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>LCCN: </label>66026753  
<br/><br/><label>Nat. Bib. No.: </label>GB67-19128 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rock mechanics.<br/>Underground construction.
<br/><br/><label>Dewey Class. No.: </label>625.15  / OBE