Webster, Robert <br/><br/>
Practical gemmology 

 - 5th Ed.; 
 - London :  N.A.G.Press,  1943. 
 - 209p.;  ill.;  19cm 
<br/><br/><label>ISBN: </label>0-7198-0011-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Games<br/>Earth Sciences
<br/><br/><label>Dewey Class. No.: </label>553.8  / WEB