Hirsch, A. Adler <br/><br/>
Manual for water plant operators 
by A. A. Hirsch 
 - Inc. : Brooklyn, New York  Chemical Pub. Co.  1945 
 - xvii, 386 p. : ill., form, diagrs. ; 22 cm. 
<br/><br/> 'An outgrowth of the traveling school for water and sewerage system operators, conducted by the Louisiana state Department of education, Trade and industrial education division.'-Pref. 
<br/><br/>'Useful literature': p. 357-362. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--supply engineering<br/>Water--Purification