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
D14, G02, G23, G51, O33
J71, O33, J16, D91
I24, D64, J62
C91, D83
D83, D84, J64
D81, D83, I24
I24 I26