Needham, James G; Needham, Paul R <br/><br/>
Guide to the study of fresh-water biology 

 - 5 
 - Holden-Day, San Francisco  1967 
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<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aquatic ecology-- Fresh water ecology-- Pond ecology-- Limnology
<br/><br/><label>Dewey Class. No.: </label>577.6  NEE-G5