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54 Environmental Sciences
3
Alaska
3
Arctic Regions
Carbon Isotopes
3
Cryosphere
3
Developed Countries
3
Isotopes
3
Light Nuclei
3
North America
3
Nuclei
3
Polar Regions
Tundra
3
Usa
Aquatic Ecosystems
2
Baseline Ecology
2
Beta Decay Radioisotopes
2
Beta-Minus Decay Radioisotopes
2
Carbon 14
2
Carbon Compounds
2
Carbon Cycle
2
Ecology
2
Ecosystems
2
Even-Even Nuclei
2
Nitrogen Cycle
2
Radioisotopes
2
540210 -- Environment
1
540230 -- Environment
1
540330 -- Environment
1
Animals
1
Aquatic-- Basic Studies-- (1990-)
1
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