Methods an machines for tile and other tube drainage.   

 - Rome :   FAO,   n.d. 
 -   ill. ;    29 cm. 
 - Informal Working Bulletin ;   no.6 .
<br/><br/>  Agricultural engineering. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Drain-tiles.--------<br/>Drainage.--------