C91, D83, D90
Q18, L66, D81, C93, D11
O15, J16, J24, I38, D74
C93, D83, I21, I24,
J16, J71, C90, D83
I21, I24, I26, J16, J22, J24
J16, J24, M53, O12, O15
C93, D22, D90, J16, O12
D83, J12, C93, N36
C93 - Field Experiments; H52 - Government Expenditures and Education; I21 - Analysis of Education