Indicators of environmental quality / 
Edited by William A. Thomas 
 - x, 275 p. :  il. ;  24 cm. 
 - Environmental science research ;  v.1 .
<br/><br/> Proceedings of a symposium held during the AAAS meeting in Philadelphia, Pennsylvania, December 26-31, 1971. 
<br/><br/>Incluye referencias bibliográficas e índice 
<br/><br/><label>ISBN: </label>0306363011 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CALIDAD AMBIENTAL<br/>CONTAMINACION DEL AIRE
<br/><br/><label>Dewey Class. No.: </label>628.5  / In52 1972