C93, J13, D13
Q54, Q51, D83, C91, Q58
O13 (Economic Development: Agriculture; Natural Resources; Energy; Environment; Other Primary
Products), Q48 (Energy: Government Policy), C93 (Design of Experiments: Field Experiments), L94 (Industry
C81, C93, D81
C93, D83, J16, L26, O12
C93, J15, J61, J71
C93, D0, D24, G21, I40
J22, J16, J38, D83
D83, H60, H31
F22, J61, O15, C93, O12