Krar, Stephen F. <br/><br/>
Drilling Technology 
Stephen F. Krar and J. William Oswald 
 - New York  Delmar Publishers  c1977 
 - iv, 160p.  ill.;  26cm 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>082730210X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Drilling and boring