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