C93, D83, I21, I24,
C93, D22, D90, J16, O12
D83, J12, C93, N36
C93 - Field Experiments; H52 - Government Expenditures and Education; I21 - Analysis of Education
J16, J24, C93, J33
D03, D12, D91, L94, O13, Q41, C93, H42, H53
O13, O15, Q12
C93, D91, L81
D91, D15, O16, O13
C93, D72