BULLOCK, RICHARD L <br/><br/>
RAPID EXCAVATION AND TUNNELING CONFERENCE 

 - S.E. 
 - S.L. Sin Pais  S.E.  1981 
<br/><br/> CLASIFICACION: 622.26 
<br/><br/><label>LCCN: </label>22572 
<br/><br/><label>Dewey Class. No.: </label>IBM4381