Dick, Steven J. <br/><br/>
Life on other worlds :  the 20th-century extraterrestrial life debate / 
Steven J. Dick 
 - Cambridge :  Cambridge University Press,  1998 
 - xiii, 290 p :  ill, maps, ports ;  24 cm. 
<br/><br/>Includes bibliographical references (p. 274-278) and index 
<br/><br/><label>ISBN: </label>0521620120  RM236.25 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Life on other planets<br/>Exobiology