Prokop, Friedrich W. <br/><br/>
The future economic significance of large lowgrade copper and nickel deposits / 
[by] Friedrich W. Prokop. 
 - Berlin :  Gebruder Borntraeger,  1975. 
 - 67 p. :  ill. ;  24 cm. 
 - Monograph series on mineral deposits;  no.13. .
<br/><br/><label>ISBN: </label>344312013X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Copper ores.<br/>Nichel ores.