Schwoerbel, Jürgen. <br/><br/>
Methods of hydrobiology (freshwater biology). 
Drawings, unless otherwise stated, by Walter Söllner. 
 - [1st English ed.] 
 - Oxford,  [New York]  Pergamon Press  [1970] 
 - ix, 200 p.  illus.  25 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0080066046 
<br/><br/><label>LCCN: </label>71114573  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater biology--Research.<br/>Biological apparatus and supplies.
<br/><br/><label>LC Class. No.: </label>QH96  / .S313 1970 
<br/><br/><label>Dewey Class. No.: </label>574.929