C83, C93, D81, D83, I20, I23
Economics: Empirical Analysis C93 — Field Experiments Q56 — Environment and Development
O33, C93, M53, D91, J24
J15, J71, Z13
D3, J15, J71, O12, O54, Z13.
Q23, Q56, O13, Q13, C93
I21, I24, C93, O33
O12, O14, O17, D22, L26, C93
I20; I24
I21, J24, C93