Derby, G.K. <br/><br/>
Reduction of airborne contaminants from welding exhaust at surface mines 
Derby, G.K. 
 - Washington  Bureau of mines  1982 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>CONTROL DE PROCESOS
<br/><br/><label>Universal Decimal Class. No.: </label>622.88