00674    a2200181   4500020001500000082002100015100002200036245010500058260005500163300001600218440004900234650004100283650002500324650003200349650003500381650003100416650004500447  a9068320130  a631.5818096bFRE  aFresco, Louise O.  aCassava in shifting cultivationba systems approach to agricultural technology development in Africa  aNetherlandsbRoyal Tropical  Institutec1986g1986  a240p.c22cm  aDevelopment oriented research in agriculture  aAgriculture and related technologies  aShifting cultivation  aReduced cultivation methods  aSpecial methods of cultivation  aCultivation and harvesting  aSpecific techniquesaSpecific techniques