Methane control in eastern U.S. Coal mines. Proceedings of the symposium of the Bureau of mines/Industry Technology Transfer Seminar, Morgantown, W. Va., May 30-31, 1973  
U.S. Bureau of mines. 
 - Washington  Bureau of mines.  1973 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>VENTILACION
<br/><br/><label>Universal Decimal Class. No.: </label>622.41