Barrett, Thomas Jason. <br/><br/>
Harnessing the earthworm :  a practical inquiry into soil building, soil conditioning, and plant nutrition through the action of earthworms, with instructions for intensive propagation and use of domesticated earthworms in biological soil-building. 

 - Ontario, Calif. :  Bookworm Publ. Co.,  c1976. 
 - 166 p. :  ill. ;  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earthworm culture.<br/>Earthworms.
<br/><br/><label>Dewey Class. No.: </label>631 BPC 1976 C143 Or.