Paone, James <br/><br/>
Drillability studies-laboratory percussive drilling 

 - Washington  Bureau of Mines  1969 
 - ii, 18 p.  il  26 cm 
 - RI  7300 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>borings<br/>rocks<br/>drilling equipment
<br/><br/><label>Subjects--Index Terms: </label>Rock-drills 
<br/><br/><label>Universal Decimal Class. No.: </label>622