Extraterrestrials  where are they? 
edited by Michael H. Hart and Ben Zuckerman 
 - New York  Pergamon Press  1982 
 - ix+182p.  figs; index 
<br/><br/><label>ISBN: </label>0-08-026341-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Extraterrestrial Creatures
<br/><br/><label>Universal Decimal Class. No.: </label>52:573.5  / HAR