Discover rocks and minerals 

 - Lincolnwood, IL  Publications International, Ltd.  1991 
<br/><br/> Contributing writer : Dr. Joel E. Arem. 
<br/><br/><label>ISBN: </label>1-56173-854-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rocks and minerals.  I. Title.