Webster, Robert <br/><br/>
Gemmologists' compendium / 
Robert Webster ; rev. by E. Allan Jobbins 
 - 6th ed. 
 - New York :  Van Nostrand Reinhold,  1938 
 - 235 p. :  ill. (some col.) ;  19 cm. 
<br/><br/> Originally published in 1937 by N. A. G. Press, London, under title: The gemmologists' pocket compendium 
<br/><br/><label>ISBN: </label> PND 3.25 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Precious stones
<br/><br/><label>Dewey Class. No.: </label>549.02