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| ATMOSPHERIC COMPOSITION AND STRUCTURE: Biosphere/atmosphere interactions, Evolution of the atmosphere (1) |
| BIOGEOSCIENCES: Biogeochemical cycles, processes, and modeling, Biogeochemical kinetics and reaction modeling, Nitrogen cycling (1) |
| CRYOSPHERE: Biogeochemistry (1) |
| GEOGRAPHIC LOCATION: North America (1) |
| GLOBAL CHANGE: Biogeochemical cycles, processes, and modeling, Atmosphere HYDROLOGY: Catchment (1) |
| OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL: Biogeochemical cycles, processes, and modeling (1) |
| PALEOCEANOGRAPHY: Biogeochemical cycles, processes, and modeling (1) |