Schwoerbel, Jürgen. <br/><br/>
Methods of hydrobiology :  (freshwater biology) / 
Jürgen Schwoerbel 
 - 1st English ed. 
 - New York :  Pergamon Press,  1970. 
 - ix, 200 p. :  ill. ;  25 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0080066046 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater biology--Research.<br/>Biological apparatus and supplies.
<br/><br/><label>Dewey Class. No.: </label>577.6  / SCM 1970