Biological control of water pollution / 
edited by Joachim Tourbier and Robert W. Pierson. 
 - Philadelphia :  University of Pennsylvania Press,  1976 
<br/><br/> "This publication is based, in part, upon concepts and techniques presented at the International Conference on Biological Water Quality Improvement Alternatives, held on March 3-5, 1975 at the University of Pennsylvania..." 
<br/><br/><label>ISBN: </label>0812277090