Schwoerbel, Jurgen. <br/><br/>
Methods of hydrobiology :  freshwater biology / 
by Jurgen Schwoerbel ; Drawings, unless otherwise stated, by Walter Sollner. 
 - Oxford ;  Pergamon Press,  1970. 
 - ix, 200 p. : 
<br/><br/><label>ISBN: </label>SC68 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater biology
<br/><br/><label>Dewey Class. No.: </label>578.76  / Me