Webster, Robert <br/><br/>
Gems: Their sourse, descriptions and identification 

 - 4 
 - Methuen & Company, London  1983 
 - 1006 
 - .
<br/><br/>  
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gems; Economic geology
<br/><br/><label>Dewey Class. No.: </label>553.8  WEB-G4