Wastewater treatment skill training   : anaerobic digestion 
/Water Pollution Control Federation. 
 - 1a ed. 
 - Washington, District of Columbia :  Water Pollution Control Federation,  1981 
 - 235 p. :  il. ;  28 cm. 
<br/><br/> V.1 Administration guide --  V.2 Workbook. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aguas residuales--Purificación
<br/><br/><label>LC Class. No.: </label>TD769  / W38 1981