Q12, O13, C93, Q18, O21, O53
O12,O13, O33, Q12,Q16
I21, I28, D83, C91, C93, O33
F22, J61, D22
C93, J54, O12, O13
J16, J24, I11, O33, L86
Q41, D12, Q48, O13, C93
N57,O12,O13,Q12,Q16,Q18
C93, O33, L82, D83
), O13 (Economic Development: Agriculture; Natural Resources; Energy; Environment), C93 (Field Experiments)