Ehrenfeld, David W. <br/><br/>
Conserving life on earth / 
by David W. Ehrenfeld 
 - New York :  Oxford University Press,  1972 
 - xv, 360 p. :  ill. ;  24 cm. 
<br/><br/> Published in 1970 under title: Biological conservation. 
<br/><br/>Bibliography: p. 337-351. 
<br/><br/><label>LCCN: </label>72-085776 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nature conservation<br/>Ecology