Coal Age Operating Handbook of Coal Preparation / 
Ed by Merritt C.Paul. 
 - New York :  McGraw-Hill,  1978. 
 - VI,310s.,il.,bibliogr. ;  28cm. 
<br/><br/> Coal Age Library of Operating Handbooks.Vol.3. 
<br/><br/><label>Universal Decimal Class. No.: </label>622.232