I12, I18, J16, O15
I28 and O15
C93, I21, I25, J13, O12, O15
O12, O13, O15, Q01
O15, O12, I15, J13, J24
J24, J61, J64, I26, O15, D82.
C93, I21, J24, D83, O15
I20, I21, J24, O15
I20 I21 I22 I24 C93 O15
I25: Education and Economic Development, C93: Field Experiments, O33: Technological Change. Diffusion and Adoption, O55: Africa