Stenquist, Richard J. <br/><br/>
Converting rock trickling filters to plastic media :  design and performance / 
Richard J. Stenquist, Kathryn A. Kelly Brown and Caldwell Walnut Creek 
 - Ohio :  United States Environmental Protection Agency,  1980 
 - xiii, 178 p. :  ill ;  28 cm. 
<br/><br/> EPA-600/2-80-120 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plastics machinery<br/>Plastics--Mixing
<br/><br/><label>Dewey Class. No.: </label>668.41