Riley, Peter D.  <br/><br/>
Earth / 
Peter D. Riley. 
 - Oxford :  Heinemann,  c 1998. 
 - 32 p. :  ill. 
<br/><br/><label>ISBN: </label>0431084386 9780431084381 
<br/><br/><label>Dewey Class. No.: </label>525.35