Claassen, Stanley L. <br/><br/>
Management of tillage equipment on research farms 
/ Stanley L. Claassen 
. - Ibadan  : International Institute of Tropical Agriculture, 1993
. - 32 p.  : ill.  ; 21 cm. 
 - IITA Research guide  10 .
<br/><br/><label>Universal Decimal Class. No.: </label>631.