Anderson, B.W. <br/><br/>
Gem Testing 

 - 9th Ed.; 
 - Toronto:  Butterworths,  1980. 
 - 434p.;  22 cm 
<br/><br/><label>ISBN: </label>0-408-00440-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gem <br/>Testing
<br/><br/><label>Dewey Class. No.: </label>549.133  / AND