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54 Environmental Sciences
2
Alaska
2
Arctic Regions
2
Baseline Ecology
Beta Decay Radioisotopes
2
Beta-Minus Decay Radioisotopes
2
Carbon 14
2
Carbon Cycle
Carbon Isotopes
2
Cryosphere
2
Developed Countries
2
Ecology
Even-Even Nuclei
2
Isotopes
2
Light Nuclei
2
Nitrogen Cycle
2
North America
2
Nuclei
2
Polar Regions
2
Radioisotopes
2
Tundra
2
Usa
2
540230 -- Environment
1
540330 -- Environment
1
Aquatic Ecosystems
1
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
1
Aquatic-- Radioactive Materials Monitoring & Transport-- (1990-)
1
Carbon Compounds
1
Carbon Dioxide
1
Carbon Oxides
1
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