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54 Environmental Sciences
2
Alaska
2
Animals
Aquatic Ecosystems
Carbon Isotopes
2
Developed Countries
2
Ecosystems
2
Energy Budgets
2
Isotopes
2
Light Nuclei
2
North America
2
Nuclei
2
Tundra
2
Usa
2
540210 -- Environment
1
540220 -- Environment
1
540320 -- Environment
1
540330 -- Environment
1
Aquatic-- Basic Studies-- (1990-)
1
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
1
Aquatic-- Radioactive Materials Monitoring & Transport-- (1990-)
1
Arctic Regions
1
Beta Decay Radioisotopes
1
Beta-Minus Decay Radioisotopes
1
Biological Pathways
1
Bryophyta
1
Carbon 13
1
Carbon 14
1
Carbon 14 Compounds
1
Carbon Compounds
1
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