As we live and breathe :  the challenge of our environment / 
Gilbert M. Grosvenor. 
 - Washington , D.C. :  National Geographic Society,  1971 
 - 239 p. :  ill. ;  26 cm. 
<br/><br/>A collection of essays by various authors. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0870440977 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Human ecology--Collections.<br/>Human beings--Influence on nature--Collections.