Simmons, W.R. <br/><br/>
NOAA technical report ERL 216 - WPL 17 :  acoustic echo sounding as related to air pollution in urban environments/ 
W.R. Simmons, J.W. Wescott and F.F.  Hall 
 - Washington :  United States Dept. of Commerce,  1971 
 - iii, 19 p. ;  ill. ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sound recording<br/>Sound Technology
<br/><br/><label>Dewey Class. No.: </label>621.3893