Downing, John A. <br/><br/>
A MAnual on Methods for the Assessment of Secondary Productivity in Fresh Water 
/ edited by John A. Downing 
 - 2nd ed. 
 - Oxford;  Blackwell Scientific Publications:  1984. 
 - xxiv, 501p. 
<br/><br/><label>ISBN: </label>0632006161 
<br/><br/><label>Dewey Class. No.: </label>574.52632  / DOW/A