Valkovic, Vlado <br/><br/>
Trace Elements In Coal ( Volume-1 ) 
/ by Vlado Valkovic 
 - Boca Raton, Florida  CRC Press, Inc.,  1983. 
 - 210p. 
<br/><br/><label>ISBN: </label>0849354919 
<br/><br/><label>Dewey Class. No.: </label>662.622  / VAL/T