Claassen, Stanley L. <br/><br/>
Planters on agricultural research farms 
/ Stanley L. Claassen 
. - Ibadan  : International Institute of Tropical Agriculture, 1993
. - 35 p.  : ill. : couv. ill.  ; 21 cm. 
 - IITA Research Guide  13 .
<br/><br/>Bibliogr 
<br/><br/><label>Universal Decimal Class. No.: </label>630