Theobald, G. H. <br/><br/>
Methods and machines for tile and other tube drainage / 
prepared by G. H. Theobald. 
 - Rome :  Food and Agriculture Organization of the United Nations,  1963. 
 - 104 p. :  ill. ;  23 cm. 
 - FAO Agricultural Development Paper ;  no.78 .
<br/><br/>Includes bibliographical references : p. [101]-104. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Drainage.<br/>Drain-tiles.