Proceedings of the National Academy of Sciences <br/><br/>
NAS Colloquium  Geology, Mineralogy, and Human Welfare 

 -  National Academies Press  1999. 
 - 144 Pages 
<br/><br/><label>ISBN: </label>0309064260 
<br/><br/><label>Dewey Class. No.: </label>550  /