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02 Petroleum
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Arctic Regions
4
Tundra
4
54 Environmental Sciences
3
03 Natural Gas
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Chemistry
2
Deposition
2
Drilling
2
Environmental Impacts
2
Gas Hydrates
2
Geology
2
Geophysics
2
Hydrates
2
Hydrology
2
Melting
2
Meteorology
2
Natural Gas
2
Permafrost
2
Petroleum
2
Runoff
2
Snow
2
Terrestrial Ecosystems
2
Weather
2
020900
1
020900 -- Petroleum-- Environmental Aspects
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Alaska
1
Alaska 540210
1
Atmospheric Precipitations
1
Basic Studies
1
Cryosphere
1
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