Pennak, Robert W. <br/><br/>
Fresh-water invertebrates of the United States / 
by Robert W. Pennak 
 - 2nd ed. 
 - New York :  John Wiley & Sons,  1978 
 - xv, 803 p. :  ill. ;  26 cm. 
<br/><br/> 'A Wiley-Interscience publication.' 
<br/><br/>Includes bibliographies and index 
<br/><br/><label>ISBN: </label>0471042498 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater invertebrates--United States