01191cam a22003257a 4500 CHAP 20220329133201.0 971013s1991 r 00010 d 3121 4093 3295 CHAP Folleto 12842 Okigbo, Bede N. 82939 Development of sustainable agricultural production systems in Africa : roles of international agricultural research centers and national agricultural research systems Ibadan, Nigeria : International Institute of Tropical Agriculture, 1991 65 p. : ilus BATCH-UPD 10 20130110 UCH01 0026 BATCH-UPD 10 20130110 UCH01 1143 BATCH-UPD 10 20130410 UCH01 0820 BATCH-UPD 10 20130914 UCH01 1849 CONVERSION 10 20130109 UCH01 1303 Agricultura de subsistencia. 1998 Agricultura Africa Africa. 175391 Agricultura Investigacion Africa. 1578 Sistemas de producción. 106767 BK FOLL Folleto 12842 BC FOLL -12806 TS1 3295 D i 3121 3121 0 0 local 0 1 0 FOLL BC BC PA_FOLLETOS 2012-12-17 FOLL 0 Folleto 12842 -12806 2019-12-31 00:00:00 2012-12-17 FOLL