Benton, Michael J. <br/><br/>
When life nearly died :  the greatest mass extinction of all time / 
Michael J. Benton 
 - New York :  Thames & Hudson,  2003       
 - 336 p. 
<br/><br/><label>ISBN: </label>050005116x 
<br/><br/><label>LC Class. No.: </label>QE 721.2 B478w 2003