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- 09 biomass fuels1
- 090800 -- biomass fuels-- production-- (1990-)1
- 29 energy planning, policy and economy1
- 29 energy planning, policy and economy environmental quality1
- 290300 -- energy planning & policy-- environment, health, & safety1
- 54 environmental sciences biomass plantations1
- 540120 -- environment, atmospheric-- chemicals monitoring & transport-- (1990-)1
- cost1
- cost benefit analysis1