Dictrich, R.V. <br/><br/>
Gems granites and gravels  knowing and using rocks and minerals 
R.V. Dictrich and, Brian J. Skinner. 
 - Cambridge  Cambridge University Press  1990 
 - viii,173p., ill.; 24cm. 
<br/><br/><label>ISBN: </label>521344441 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pearls Rocks, Igneous. 
<br/><br/><label>Dewey Class. No.: </label>549  / D44G