Control of sulfur oxide emissions in copper, lead, and zinc smelting  
U.S. Bureau of mines. 
 - Washington  Bureau of mines.  1971 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>VENTILACION DE MINAS
<br/><br/><label>Universal Decimal Class. No.: </label>622.4