Brook, Parkman T. <br/><br/>
Geologic and ground-control aspects of an experimental shortwall operation in the upper Ohio Valley 
Brook, Parkman T.; McDonald, W. Richard 
 - Washington  Bureau of mines  1975 
 - 9 p. 
 - RI 8113 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>MINING
<br/><br/><label>Subjects--Index Terms: </label>CORTE ELECTROQUIMICO SUBPRODUCTOS ELECTROCHEMICAL CUTTING BY-PRODUCTS 
<br/><br/><label>Universal Decimal Class. No.: </label>622