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*ARCTIC REGIONS
CONTINENTAL SHELVES
5
*SEA ICE
3
ARCTIC OCEAN
3
CANADA
3
CLIMATE
3
DENMARK
3
Ice and Permafrost
3
NATIONAL SECURITY
3
NORWAY
3
POLLUTION
3
RUSSIA
3
Snow
3
ALASKA
2
CONGRESS
2
GASES
2
GLOBAL
2
GREENLAND
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
WEATHER
2
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