Dietrich, R.V., Skinner, Brian J. <br/><br/>
Gems, granites and gravels : knowing and using rocks and minerals 

 - Cambridge  CUP  1990 
 - viii, 174p, 24cm 
<br/><br/><label>ISBN: </label>0521344441 
<br/><br/><label>Dewey Class. No.: </label>553,  / D, die