Verschuur, Gerrit L. <br/><br/>
Impact! : The Threat of Comets and Asteroids 
Verschuur, Gerrit L. 
 -  Oxford University Press  1997 
 - On-campus e-Book by ebrary under Digital Library Program of Higher Education Commission (HEC) of Pakistan 
<br/><br/><label>ISBN: </label>9780198026174     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical Science