Methods and machines for tile and other tube drainage /    
G.H. Theo bald 
 - Rome :   FAO,   1963. 
 - xiii, 104 p. :    ill. ;    23 cm. 
 - FAO Agricultural Development Paper ;   no.78 .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Drainage.--------<br/>Drain-tiles.--------