B W Anderson <br/><br/>
Gem testing 

 - 10th ed 
 - Butterworths, Singapore  c1990 
 - x,390p 
<br/><br/><label>ISBN: </label>0 408 02320 1 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>Polytechnic - Jewelery
<br/><br/><label>Dewey Class. No.: </label>736.2 And