Wallwork, John A. <br/><br/>
Earthworm biology / 
John A. Wallwork 
 - London :  Edward Arnold,  1983 
 - 58p.:  ill. ;  22 cm. 
 - The Institute of Biology's studies in biology  no.161 .
<br/><br/><label>ISBN: </label>0713128844 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Opisthopora