Manual of instruction for sewage treatment plant operators  
New York State Department of Health  
 - New York:   Health Education Service   n.p.  
 - 242p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage disposal-Instruction <br/>Water-Pollution <br/>Municipal engineering <br/>Public health education 
<br/><br/><label>Dewey Class. No.: </label>628.3  / MAN