Norton, Bryan G. <br/><br/>
Why preserve natural variety ? /Bryan G. Norton. 

 - Princeton  PUP  1987 
 - xiii, 281p 
 - Studies in moral, political and legal philosophy .
<br/><br/><label>ISBN: </label>0691077622 
<br/><br/><label>Dewey Class. No.: </label>333.9515  / N87