Hegner, Robert William,  1880-1942 <br/><br/>
Invertebrate zoology / 
Robert W. Hegner, Joseph G. Engemann 
 - 2nd ed 
 - New York :  MacMillan,  1968 
 - 619 p. :  ill. ;  24 cm 
<br/><br/>Includes bibliographies 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Invertebrates