Industrial minerals directory  : a world guide to producers and processors/ 
edited by G.M. Charke 
 - England:  Metal bulletin books,  1987 
 - lvii, 704p.:  ill. 
<br/><br/> Includes index  book 
<br/><br/><label>ISBN: </label>0-900542-99-3 
<br/><br/><label>Source: </label> purchase 
<br/><br/><label>LC Class. No.: </label>HD 9506  / .A2 I53 1986