Olsen, O. Wilford  1901- <br/><br/>
Animal parasites :  their life cycles and ecology / 
by O. Wilford Olsen 
 - 3rd ed. 
 - Baltimore :  University Park Press,  1974 
 - 562 p. :  ill. ;  29 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0839106432 
<br/><br/><label>LCCN: </label>73-017411 //r902 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Parasitology<br/>Parasites--Life cycles