Water treatment plant operation / 
V.W. Langworthy, series editor 
 - Ann Arbor, Mich. :  Ann Arbor Science Publishers,  1981 
 - 4 v. :  ill. ;  23 cm. 
<br/><br/> v.1. Review manual for operators - v.2. Mathematics for operators - v.3. Hydraulics for operators - v.4. Chemistry for operators 
<br/><br/>Includes indexes 
<br/><br/><label>ISBN: </label>0250405032 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water treatment plants<br/>Water--Purification