World's best science fiction 1971 / 
edited by Donald A. Wollheim and Terry Carr. 
 - New York, N.Y. :  Ace Books,  1971. 
 - 349 p. 
<br/><br/> Title on cover : the year's finest tales of wonder by, : Theodore Sturgeon, Isaac Asimov, Clifford D. Simak, Robert Silverberg, Larry Niven and many more. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fiction--Science fiction--General.