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

 - London:  Butterworths,  1962. 
 - 938p.;  26 cm 
<br/><br/><label>ISBN: </label>408705736 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth Sciences
<br/><br/><label>Dewey Class. No.: </label>553.6  / WEB