Welch, Paul S.  1882-1959 <br/><br/>
Limnological methods / 
by Paul S. Welch. 
 - New York :  McGraw-Hill,  c1948. 
 - xviii, 381 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Limnology<br/>Freshwater biology
<br/><br/><label>Dewey Class. No.: </label>551.48  / WEL 1948