Downing, John A  . <br/><br/>
A manual on methods for the assessment of secondary productivity in fresh waters /  
edited by John A. Downing and Frank H. Rigler. 
 - London :   Blackwell Scientific Publns. ,   1984. 
 - 501p. :   ills ;   22cm .  
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0632006161  UKP 32.50 
<br/><br/><label>Subjects--Index Terms: </label>FRESHWATER PRODUCTIVITY 
<br/><br/><label>Dewey Class. No.: </label>553.7  / DOW/M