Webster, Robert. <br/><br/>
Gems: Their Sources, Descriptions and identification /  

 - 3rd ed. /  
 - London WC2B 6AB :   Butterworth & Co (Publishers) ,   1984 
 - xviii,938p ;  
<br/><br/><label>ISBN: </label>0 408 70573 6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ruby 
<br/><br/><label>Dewey Class. No.: </label>H19  / L5W