P17, P25, Z12, O15, I30, H70, H11
P25, Z12, O15, I30, D90, D91
C93, D91, I12
P25, Z12, O15, I30, P42
C93, I20, I28, O15
C93 Field Experiments; I21 Analysis of Education; I22 Educational Finance; I25 Education and Economic Development
I25, I28, O15
C93, I21, I24, J24, O15
C83, D31, H41, I14, O15, Q53
I12, I14, J15, D91