Welch, Paul Smith,  1882- <br/><br/>
Limnological methods. 

 - Philadelphia,  Blakiston Co.  [1948] 
 - xviii, 381 p.  illus.  24 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater biology--Research.<br/>Limnology.
<br/><br/><label>LC Class. No.: </label>QH96  / .W39 
<br/><br/><label>Dewey Class. No.: </label>574.929