I25, I30, J13, O15, O55
I25 D85 L86 O55
I25: Education and Economic Development, C93: Field Experiments, O33: Technological Change. Diffusion and Adoption, O55: Africa
O12, O13, O33, O55, Q12. Q16
D72, O55, P16
O13, O33, O55
D22, Q54, O14, O55
D01, D81, O12, O55
D72, O13, O55, P16.
C93, D91, D04, I21, O55