Exploring new ethics for survival :  the voyage of the spaceship Beagle 
Garrett Hardin.  
 - Baltimore, Md.  Penguin Books  1973, c1972.  
 - xii, 273 p.  24 cm. 
 - Pelican book  A1699. .
<br/><br/>Includes bibliographical references and index.  
<br/><br/><label>ISBN: </label>0140216995 9780140216998 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Birth control.<br/>Human ecology.<br/>Population.
<br/><br/><label>LC Class. No.: </label>HB871  / .H347