Okigbo, Bede N. <br/><br/>
Development of sustainable agricultural production systems in Africa  : roles of International Agricultural Research Centers and National Agricultural Research Systems 
/ Bede N. Okigbo 
. - Ibadan  : International Institute of Tropical Agriculture, 1991
. - 66 p.  : ill., couv. ill.  ; 26 cm. 
<br/><br/>Bibliogr. 
<br/><br/><label>Source: </label> Don 
<br/><br/><label>Universal Decimal Class. No.: </label>631.559.