Aquatic insects of California : with keys to north American genera and California species / 
edited by Robert L. Usinger. 
 -- Los Angeles :   University of California Press,   cop. 1956 
 - 508 p. 
<br/><br/>ISBN 0-520-01293-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Insectos acuáticos - California
<br/><br/><label>Universal Decimal Class. No.: </label>595.7(794)