Operation of Wastewater Treatment Plants :  A Field Study Training Program / 
Environmental Protection Agency. 
 - Third Edition  Fourth Printing 
 - Sacramento, California :  Hornet Foundation, Inc.,  1990. 
 - vol. 
<br/><br/>Includes Index 
<br/><br/> vol. 1 ( 1990, 504 p.)  vol. 2 ( 1989, 653 p.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Engineering