D1, I3, J2, J13
P25, Z12, O15, I30, J16, J12
P25, Z12, O15, I30
P17, P25, Z12, O15, I30, H70, H11
P25, Z12, O15, I30, D90, D91
P25, Z12, O15, I30, P42
A14, C91, J16, J70
C93, I20, I28, O15
C93, D9, I31, J15, O12
C93 Field Experiments; I21 Analysis of Education; I22 Educational Finance; I25 Education and Economic Development