Schwoerbel, Jurgenu. <br/><br/>
Methods of hydrobiology (freshwater biology) / 
Jurgen Schwoerbel ; Drawings, unless otherwise stated, by Walter Sollner. 
 - 1st English ed. 
 - Oxford :  Pergamon Press,  1970 
 - ix, 200 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><br/>engger 
<br/><br/><label>ISBN: </label>0080066046 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater biology--Research<br/>Biological apparatus and supplies