Ehrenfeld, David W. <br/><br/>
Biological conservation / 
by David W. Ehrenfeld 
 - New York :  Holt, Rinehart and Winston,  [1970] 
 - xi, 226 p. : illus. (part col.), maps. ; 24 cm. 
<br/><br/> Published in 1972 under title: Conserving life on earth 
<br/><br/>Includes bibliographies 
<br/><br/><label>ISBN: </label>0030800498 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nature conservation<br/>Wildlife conservation<br/>Pollution