Theobald, G. H. <br/><br/>
Methods and machines for tile and other tube drainage / 
prepared by G.H. Theobald. 
 - Rome :  Food & Agriculture Organization of the United Nations,  c1963. 
 - xiii, 104 pages :  Illustrations ;  23 cm. 
<br/><br/> Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Drain-tiles.<br/>Drainage.