Welch, Paul Smith, <br/><br/>
Limnological methods. 

 - Philadelphia,  Blakiston Co.  [1948] 
 - xviii, 381 p.  illus.  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater biology<br/>Limnology.
<br/><br/><label>Dewey Class. No.: </label>574 BLA 1948 A023 Or.