Helfrich, Harold W., ed. <br/><br/>
The environmental crisis  Man's struccle to live with himself 
Harold W. Helfrich , ed. 
 - 4th print 
 - New Haven, London  Yale University Press  c1970 
 - vii, 187p. ;  20 x 13cm 
<br/><br/><label>LCCN: </label>20508 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Man--Influence of environment
<br/><br/><label>Dewey Class. No.: </label>304.28/H474e