Directo, Leon S. <br/><br/>
Effect of pretreatment on the filtration of low turbidity secondary effluent / 
by Leon S. Directo, Ching-lin Chen and Robert P. Miele 
 - Washington, D.C. :  United States Government Printing Office,  1980 
 - 75 p. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage--Purification<br/>Filtration
<br/><br/><label>Dewey Class. No.: </label>628.352