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*ARCTIC REGIONS
5
CONTINENTAL SHELVES
5
*SEA ICE
4
ARCTIC OCEAN
4
CLIMATE
4
Ice and Permafrost
4
NATIONAL SECURITY
4
Snow
4
CANADA
3
CONGRESS
3
DENMARK
3
NORWAY
3
POLLUTION
3
RUSSIA
3
ALASKA
2
GASES
2
GLOBAL
2
GREENLAND
2
Government and Political Science
2
MERCHANT VESSELS
2
MINERALS
2
RISK
2
SEA ICE
2
SEASONS
2
SHIPPING
2
SHORES
2
STRATEGY
2
TEMPERATURE
2
UNITED STATES
2
WATER
2
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