An introduction to sewage treatment. 

 -  Institute of Water Pollution Control,  1987. 
 - 51 p. :  plates ;  24 cm. 
<br/><br/>Includes bibliography and index. 
<br/><br/> Open access. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage--Purification.<br/>Sewage--Purification.