Kraus, Edward Henry <br/><br/>
Gems and gem materials. 

 - New York :  McGraw-Hill,  1941. 
 - 285 p. :  il. ;  21 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Joyería<br/>Gema
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>671.15