Pennak, Robert W. <br/><br/>
Fresh-water invertebrates of the United States :  protozoa to mollusca / 
Robert W. Pennak 
 - 3rd ed. 
 - New York ;  Chichester :  Wiley,  1989 
 - xvi, 628 p. :  ill. ;  26 cm 
<br/><br/> "A Wiley-Interscience publication." 
<br/><br/>Includes bibliographies 
<br/><br/><label>ISBN: </label>0471631183 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater invertebrates--United States
<br/><br/><label>Dewey Class. No.: </label>592.0973  / PEF 1989