Hartwell, David G  <br/><br/>
The ascent of wonder  : the evolution of hard SF 

 - New York  : Tom Doherty Association Inc,  1994. 
 - 990p.  : ill.  ; 24cm. 
<br/><br/><label>ISBN: </label>0-312 -85062 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science fiction<br/>Literature and Science
<br/><br/><label>LC Class. No.: </label>PS374.S35A77