Stefanko, Robert, <br/><br/>
Coal mining technology :  Theory and practice / 
By Robert stefanko ; ed. christopher j. bise 
 - 410 páginas 
<br/><br/><label>ISBN: </label>0895204045 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Minas de carbón
<br/><br/><label>LC Class. No.: </label>TN803  / S83