), O13 (Economic Development: Agriculture; Natural Resources; Energy; Environment), C93 (Field Experiments)
D12, E52, E58
C93, D44, Q57
J23, J24, J70, C93
C83; C91; D64; D90; Z13
D83, D91, G41, G50, G53
Z12, D83, C93
C11, C90, D83, D91
B4, C1, C91, C92, D81
J16, I29, C93