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Ice and Permafrost
6
Snow
6
ARCTIC OCEAN
4
*ARCTIC REGIONS
3
*SEA ICE
3
CLIMATE
3
CONGRESS
3
CONTINENTAL SHELVES
3
NATIONAL SECURITY
3
NORWAY
3
ALASKA
2
ARCTIC REGIONS
2
CANADA
2
DENMARK
2
GASES
2
GLOBAL
2
GREENLAND
2
INTERNATIONAL
2
MERCHANT VESSELS
2
MINERALS
2
POLLUTION
2
RISK
2
RUSSIA
2
SEA ICE
2
SHORES
2
TEMPERATURE
2
UNITED STATES
2
WATER
2
(*ICE
1
*AIRCRAFT
1
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