Pedersen, Maggie Campbell  . <br/><br/>
Gem and ornamental materials of organic origin /  
by Maggie Campbell Pedersen. 
 - Oxford :   Elsevier Ltd. ,   2004 
 - xiv, 268p ;  
<br/><br/><label>ISBN: </label>0-7506-58525 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ornamental materials
<br/><br/><label>Dewey Class. No.: </label>J1.55  / P4