Spellman, Frank R. <br/><br/>
Spellman's standard handbook for wastewater operators / 
Frank R. Spellman. 
 - 2nd ed. 
 - Boca Raton :  CRC Press,  c2011. 
 - 3 v. :  ill. ;  28 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/>v. 1. Fundamental level -- v. 2. Intermediate level -- v. 3. Advanced level. 
<br/><br/><label>ISBN: </label>9781439818848 (hbk, v. 1 :) 9781439818862 (hbk, v. 2 ) 9781439818886 (hbk, v. 3) 9781439818909 (3 vol. set) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage disposal--Employees--Certification--United States--Handbooks, manuals, etc.<br/>Sewage disposal plants--United States--Handbooks, manuals, etc.