Obert, Leonard, 1906-  Obert, Leonard, 1906- <br/><br/>
Rock mechanics and the design of structures in rock / 
[by] Leonard Obert [and] Wilbur I. Duvall. 
 - New York :  Wiley,  [1967] 
<br/><br/>Includes bibliographies. 
<br/><br/><label>LCCN: </label>66026753 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rock mechanics.<br/>Underground construction.
<br/><br/><label>LC Class. No.: </label>TA706  / .O2 
<br/><br/><label>Dewey Class. No.: </label>624/.15