Universal Decimal Classification: UDC 622, mining :  UDC 622, mining. mineral dressing 

 - 4. ed 
 - 32 p. 
 - FID Publication ; n. 179 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>minerais
<br/><br/><label>Universal Decimal Class. No.: </label>025.45CDU  / F293u