Okigbo, B.N. <br/><br/>
Development of sustainable agricultural production systems in africa:  Role of international agricultural research centers and national agricultural reseach systems/by     print resource 
Bede N. Okigbo. 
 - Ibadan-Nigeria:  International institute of tropical agriculture (IITA),  1991. 
 - ii, 66p.:  ill.;  25cm. 
<br/><br/>includes bibliography 
<br/><br/><label>Source: </label>B-12269 
<br/><br/><label>Subjects--Topical Terms: </label>--Book
<br/><br/><label>LC Class. No.: </label>SB111  / .O44  1991