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- 09 biomass fuels1
- 090900 -- biomass fuels-- processing-- (1990-)1
- 12 management of radioactive wastes, and non-radioactive wastes from nuclear facilities abundance1
- 54 environmental sciences biomass conversion plants1
- 540120 -- environment, atmospheric-- chemicals monitoring & transport-- (1990-)1
- 664200 -- spectra of atoms & molecules & their interactions with photons-- (1992-)1
- 74 atomic and molecular physics1
- air pollution monitoring1
- aqueous solutions1