Conference on "Man and his environment  : a view towards survival", UNESCO, California, November 1969 / <br/><br/>
No deposit-no return  ; anthology of papers presented at 13th national conference / 

 - Massachusetts  Addison-Wesley  1970 
 - xvi, 351p. 
<br/><br/><label>Dewey Class. No.: </label>304.2  / C748.ND