C91, D03, D83
C93,D01,D83,D90,D91,I12
C93, D91, Q18
D91, C93, D81, D87
D91, C93, D81, D87
C93, I12, D90, C91, M50
J6, C93, D91, O15, J01
C21, C93, D1, D81, D90, I12, I21
C21; C93; D1; D81; D90; I12; I21
C93 Field Experiments; F35 Foreign Aid; F22 International Migration; F51 International Conflicts; Q54 Climate