Downing, John A. <br/><br/>
A Manual on methods for the assessment of secondary productivity in fresh waters / 
John A. Downing and Frank H. Rigler. 
 - 2nd ed. 
 - Boston :  Blackwell Scientific Publications ;  1984 
 - xxiv, 501 p.  : tables, ill. figs, pictures. ;  24 cm. 
 - IBP handbook   17 .
<br/><br/>Includes bibliographies and indexes. 
<br/><br/><label>ISBN: </label>0632006161 
<br/><br/><label>LCCN: </label>85234469  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater productivity
<br/><br/><label>Dewey Class. No.: </label>574.52632  / DOM