Welch, Paul Smith,  1882- <br/><br/>
Limnology / 
Paul S. Welch 
 - 2nd ed. 
 - New York :  McGraw-Hill,  1952 
 - xiii, 538 p. :  ill. ;  24 cm. 
 - NcGraw-Hill publications in the zoological sciences .
<br/><br/>p. 443-510 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Limnology