Welson, John R. <br/><br/>
Air quality and its relationship to economic, meteorological, and other structural characteristics of urban areas in the United States /  by ... and Benjamin H. Stevens 

 - Philadelphia :  Regional Science Research Institute,  1970 
 - 81 p 
 - Regional Science Research Institute. Discussion paper series ;  no. 42 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air--Pollution
<br/><br/><label>LC Class. No.: </label>TD883 W44