MANUAL of Instruction for Water Treatment Plant Operators 
New York State Department of Health 
 - New York  Health Education Service  1961 
 - xv, 308p.  ill.;  21cm 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>2011052306 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Purification