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54 Environmental Sciences
2
Alaska
2
Aquatic Ecosystems
2
Arctic Regions
2
Baseline Ecology
2
Carbon Cycle
2
Carbon Dioxide
2
Carbon Isotopes
2
Ecological Concentration
2
Nitrogen Cycle
2
Nitrogen Isotopes
2
Tundra
2
540330
1
540330 -- Environment
1
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
1
Aquatic-- Radioactive Materials Monitoring & Transport-- (1990-)
1
Beta Decay Radioisotopes
1
Beta-Minus Decay Radioisotopes
1
Carbon 14
1
Carbon 14 540320
1
Carbon Compounds
1
Carbon Oxides
1
Chalcogenides
1
Chemicals Monitoring And Transport
1
Cryosphere
1
Developed Countries
1
Ecology
1
Ecosystems
1
Even-Even Nuclei
1
Isotopes
1
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