Walton, W. R. <br/><br/>
Earthaworms as pests and otherwise  / 
W. R. Walton 
 - Washington  :   Department of Agriculture 
 - 14 p. 
 - EUA. Dept. Agr. Farmers' Bull; 1569 .
<br/><br/><label>LCCN: </label>201864 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lombrices de tierra