O15 Economic Development: Human Resources, Human Development, Income Distribution, Migration J61
D03, D12, D91, L94, Q41, C93
D12, G22, L81. C93
H26, D91, I25, O12, C93
C93, J23, J24, M51, O33
C93, D83, D90
I21 — Analysis of Education O33 — Technological Change: Choices and Consequences; Diffusion
J23, J71, M51, C93, L31
O15, I24, I25
C93, D83, D91, I23, I31, L82, L86, O33