Irwin,Neil <br/><br/>
Understanding crystals / 
Irwin,Neil. 
 - London:  aquarian press,  1991. 
 - 127p;22cm 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>1855380641 
<br/><br/><label>Dewey Class. No.: </label>548 IRW