Welch, Paul Smith,   1882- <br/><br/>
Limnological methods /  
by Paul S. Welch. 
 - New York :   McGraw-Hill,   c1948. 
 - xviii, 381 p. :   il. 
<br/><br/><label>LCCN: </label>48009828  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biologia de įgua doce--Pesquisa.<br/>Limnologia.
<br/><br/><label>Dewey Class. No.: </label>574.929