Hurlbut, Cornellius S. (Cornelius Searle),  1906- <br/><br/>
Gemology / 
Cornelius S. Hulburt, George S. Switzer 
 - New York :  John Wiley & Sons,  1979 
 - 243 p. :  il. ;  l 25 cm. 
<br/><br/> 'A Wiley-Interscience publication' 
<br/><br/>Includes bibliographies 
<br/><br/><label>ISBN: </label>047142224X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Precious stones