Obert, Leonard,  1906-, <br/><br/>
Rock mechanics and the design of structures in rock / 
By Leonard obert and wilbur i. duvall. 
 - 650 páginas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Construcciones subterráneas<br/>Mecánica de rocas
<br/><br/><label>LC Class. No.: </label>TA706  / O23