Chug, Om P. <br/><br/>
Manual of drilling technology 

 - New Delhi  Oxonioan Press  1985 
 - 567p. 
<br/><br/><label>ISBN: </label> RS 71.50 
<br/><br/><label>Source: </label> RS 71.50 
<br/><br/><label>Dewey Class. No.: </label>621.952 CHU