PROCEEDINGS OF THE FOURTH WVU CONFERENCE ON COAL MINE ELECTROTECHNOLOGY (AUGUST 2-4, 1978 

 - S.E. 
 - Estados Unidos  US. DEPARTMENT OF ENERGY  1978 VIRGINIA CITY 
<br/><br/><label>LCCN: </label>7675 
<br/><br/><label>Dewey Class. No.: </label>622.48