Popper, George H. <br/><br/>
Phosphate resource potential for borehole mining in the southeastern coastal plain  
Popper, George H. 
 - Washington  Bureau of mines  1985 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>POZOS <br/>FOSFATO
<br/><br/><label>Universal Decimal Class. No.: </label>622.25:553.64