Welch P S <br/><br/>
Limnological methods 

 -  1948 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>45671 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology
<br/><br/><label>Dewey Class. No.: </label>G:5:19518, H81;1