As we live and breathe :  the challenge of our environment / 
Foreword by Gilbert M. Grosvenor. Prepared by the Special Publications Division, National Geographic Society. 
 - Washington :  National Geographic Society,  1971. 
 - 239 p. :  ill. 
<br/><br/><label>ISBN: </label>0870440977 
<br/><br/><label>LCCN: </label>74151945 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology--Collected works.
<br/><br/><label>Dewey Class. No.: </label>301.3